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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2017	Jan. 31, 2018	Jun. 30, 2017
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Registrant Name	UNITED TECHNOLOGIES CORP /DE/
Entity Central Index Key	0000101829
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 97,490,067,627
Entity Common Stock, Shares Outstanding		799,778,295

Consolidated Statement of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Sales:
Product sales	$ 41,361	$ 40,735	$ 39,801
Service sales	18,476	16,509	16,297
Net Sales	59,837	57,244	56,098
Costs and Expenses:
Cost of products sold	31,027	30,325	29,771
Cost of services sold	12,926	11,135	10,660
Research and development	2,387	2,337	2,279
Selling, general and administrative	6,183	6,060	5,886
Total costs and expenses	52,523	49,857	48,596
Other Income	1,358	785
Other Expenses			211
Operating profit	8,672	8,172	7,291
Interest Expense, net	909	1,039	824
Income from continuing operations before income taxes	7,763	7,133	6,467
Income tax expense	2,843	1,697	2,111
Net income from continuing operations	4,920	5,436	4,356
Less: Noncontrolling interest in subsidiaries' earnings from continuing operations	368	371	360
Income from continuing operations attributable to common shareowners	4,552	5,065	3,996
Discontinued operations (Note 3):
Income from operations	0	1	252
Gain on disposal	0	13	6,042
Income tax expense		24	2,684
Net (loss) income from discontinued operations	0	(10)	3,610
Less: Noncontrolling interest in subsidiaries' earnings (loss) from discontinued operations	0	0	(2)
(Loss) Income from discontinued operations attributable to common shareowners	0	(10)	3,612
Net income attributable to common shareowners	$ 4,552	$ 5,055	$ 7,608
Earnings Per Share of Common Stock - Basic:
Net income from continuing operations attributable to common shareowners	$ 5.76	$ 6.19	$ 4.58
Net income attributable to common shareowners	5.76	6.18	8.72
Earnings Per Share of Common Stock - Diluted:
Net income from continuing operations attributable to common shareowners	5.70	6.13	4.53
Net income attributable to common shareowners	5.70	6.12	8.61
Dividends Per Share of Common Stock	$ 2.72	$ 2.62	$ 2.56
Weighted average number of shares outstanding:
Basic shares	790,000,000	818,200,000.0	872,700,000.0
Diluted shares	799,100,000	826,100,000	883,200,000

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income from continuing operations	$ 4,920	$ 5,436	$ 4,356
Net (loss) income from discontinued operations	0	(10)	3,610
Net income	4,920	5,426	7,966
Foreign currency translation adjustments
Foreign currency translation adjustments arising during period	620	(1,089)	(1,502)
Reclassification adjustments for from sale of an investment in a foreign entity recognized in net income	10	0	(42)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	610	(1,089)	(1,460)
Change in pension and post-retirement benefit plans
Net actuarial loss arising during period	241	(785)	(284)
Prior service cost arising during period	(2)	13	37
Other	(116)	542	326
Amounts reclassified, pretax - Pension	529	535	867
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	(656)	(279)	(872)
Tax (expense) benefit	(263)	(189)	(298)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(393)	(90)	(574)
Unrealized gain (loss) on available-for-sale securities
Unrealized holding gain arising during period	5	190	28
Reclassification adjustments for gain included in Other income, net	566	94	54
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent	(561)	96	(26)
Tax (expense) benefit	(213)	36	(11)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent	(348)	60	(15)
Change in unrealized cash flow hedging
Unrealized cash flow hedging gain (loss) arising during period	347	75	(415)
Loss reclassified into Product sales	39	(171)	(234)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent	308	246	(181)
Tax (expense) benefit	74	69	(51)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	234	177	(130)
Other comprehensive loss, net of tax	889	(762)	(1,031)
Comprehensive income	5,809	4,664	6,935
Less: Comprehensive income attributable to noncontrolling interest	448	324	285
Comprehensive income atrributable to common shareowners	$ 5,361	$ 4,340	$ 6,650

Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 8,985	$ 7,157
Accounts receivable (net of allowance for doubtful accounts of $456 and $450)	12,595	11,481
Inventories and contracts in progress, net	9,881	8,704
Other assets, current	1,397	1,208
Total Current Assets	32,858	28,550
Customer financing assets	2,372	1,398
Future income tax benefits	1,723	1,809
Fixed assets, net	10,186	9,158
Goodwill	27,910	27,059
Intangible assets, net	15,883	15,684
Other assets	5,988	6,048
Total Assets	96,920	89,706
Liabilities and Equity
Short-term borrowings	392	601
Accounts payable	9,579	7,483
Accrued liabilities	12,316	12,219
Long-term debt currently due	2,104	1,603
Total Current Liabilities	24,391	21,906
Long-term debt	24,989	21,697
Future pension and postretirement benefit obligations	3,036	5,612
Other long-term liabilities	12,952	11,026
Total Liabilities	65,368	60,241
Commitments and contingent liabilities (Notes 5 and 18)
Redeemable noncontrolling interest	131	296
Capital Stock:
Preferred Stock, $1 par value; 250,000 shares authorized; None issued or outstanding	0	0
Common Stock, $1 par value; 4,000,000 shares authorized; 1,444,187 and 1,440,982 shares issued	17,574	17,285
Treasury Stock— 645,057 and 632,281 common shares at average cost	35,596	34,150
Retained earnings	55,242	52,873
Unearned ESOP shares	85	95
Total Accumulated other comprehensive loss	(7,525)	(8,334)
Total Shareowners' Equity	29,610	27,579
Noncontrolling interest	1,811	1,590
Total Equity	31,421	29,169
Total Liabilities and Equity	$ 96,920	$ 89,706

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 456	$ 450
Preferred Stock, par value	$ 1	$ 1
Preferred Stock. shares authorized	250,000	250,000
Preferred Stock, shares issued	0	0
Common Stock, par value	$ 1	$ 1
Common Stock, shares authorized	4,000,000	4,000,000
Common Stock, Shares, Issued	1,444,187	1,440,982
Treasury Stock, shares	645,057	632,281

Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities of Continuing Operations:
Income from continuing operations	$ 4,920	$ 5,436	$ 4,356
Adjustments to reconcile income from continuing operations to net cash flows provided by operating activities of continuing operations:
Depreciation and amortization	2,140	1,962	1,863
Deferred income tax provision	62	398	662
Stock compensation cost	192	152	158
Canadian Government Settlement	(285)	(237)	867
Change in:
Accounts receivable	448	941	438
Inventories and contracts in progress	1,074	719	766
Other current assets	101	(49)	55
Accounts payable and accrued liabilities	1,571	450	490
Global pension contributions	2,112	303	147
Other operating activities, net	(766)	(165)	235
Net Cash Provided by Operating Activities, Continuing Operations	5,631	6,412	6,755
Investing Activities of Continuing Operations:
Capital expenditures	2,014	1,699	1,652
Increase in customer financing assets	1,197	438	364
Decrease in customer financing assets	222	217	117
Investments in businesses	231	710	538
Dispositions of businesses	70	211	200
Proceeds from the sale of the investment in Watsco Inc.	596	0	0
Increase in collaboration intangible assets	380	388	437
Payments (receipts) from settlements of derivative contracts	317	(249)	(160)
Other investing activities, net	(232)	(49)	280
Net cash flows used in investing activities of continuing operations	(3,019)	(2,509)	(2,794)
Financing Activities of Continuing Operations:
Issuance of long-term debt	4,954	6,469	1,744
Repayment of long-term debt	1,604	2,452	1,764
(Decrease) increase in short-term borrowings, net	(271)	(331)	795
Proceeds from Issuance of Common Stock - Equity unit settlement	0	0	1,100
Common Stock issued under employee stock plans	31	13	41
Dividends paid on Common Stock	2,074	2,069	2,184
Repurchase of Common Stock	1,453	2,254	10,000
Other financing activities, net	(576)	(564)	(508)
Net cash flows used in financing activities of continuing operations	(993)	(1,188)	(10,776)
Discontinued Operations:
Net cash used in operating activities	0	(2,532)	(372)
Net cash provided by investing activities	0	6	9,000
Cash used in financing activities, discontinued operations	0	0	(9)
Net cash flows (used in) provided by discontinued operations	0	(2,526)	8,619
Effect of foreign exchange rate changes on cash and cash equivalents	210	(120)	(174)
Net increase in cash and cash equivalents	1,829	69	1,630
Cash and Cash Equivalents, beginning of period	7,189	7,120	5,490
Cash and Cash Equivalents, end of period	9,018	7,189	7,120
Cash and cash equivalents of continuing operations, end of year	8,985	7,157	7,075
Supplemental Disclosure of Cash Flow Information:
Interest paid, net of amounts capitalized	974	1,157	1,057
Income taxes paid, net of refunds	1,326	4,096	2,060
Contributions of UTC Common Stock to domestic defined benefit pension plans	0	0	250
Restricted Cash And Cash Equivalents	$ 33	$ 32	$ 45

Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Unearned ESOP Shares [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interest	AOCI Including Portion Attributable to Noncontrolling Interest [Member]	Redeemable Noncontrolling Interest [Member]
Increase (Decrease) In Equity [Roll Forward]
Shareowners' Equity		$ 15,300	$ (21,922)	$ 44,611	$ (115)	$ (6,661)
Noncontrolling interest							$ 1,351
Total Equity	$ 32,564
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable Noncontrolling Interest									$ 140
Net Income - Retained Earnings	7,608			7,608
Net Income - NCI							(358)
Net income	7,966
Other comprehensive income (loss), net of tax - AOCI						(958)
Other comprehensive income (loss), net of tax - NCI							61		(12)
Other comprehensive income (loss), net of tax	(1,031)							$ (1,019)
Common Stock issued - equity unit settlement	1,100	1,100
Common Stock issued under employee plans	394	379	7	(2)	10
Common stock contributed to defined benefit plans	250	112	138
Common Stock repurchased	10,000	870	9,130
Dividends on Common Stock	2,184			2,184
Dividends on ESOP Common Stock	75			75
Dividends attributable to noncontrolling interest	337						337
Purchase of subsidiary shares from noncontrolling interest	17	12					5
Sale of subsidiary shares in noncontrolling interest	39	24					15
Acquisition of noncontrolling interest	173						173
Disposition of noncontrolling interest	4						4
Redeemable noncontrolling interest reclassification to noncontrolling interest	(2)			(2)					2
Redeemable noncontrolling interest in subsidiaries' earning	4						4		(4)
Dividends attributable to noncontrolling interest - RNCI									(3)
Purchase of subsidiary shares from noncontrolling interest - RNCI									(9)
Shareowners' Equity		16,033	(30,907)	49,956	(105)	(7,619)
Noncontrolling interest							1,486
Total Equity	28,844
Redeemable Noncontrolling Interest									122
Net Income - Retained Earnings	5,055			5,055
Net Income - NCI							(371)
Net income	5,426
Other comprehensive income (loss), net of tax - AOCI						(715)
Other comprehensive income (loss), net of tax - NCI							27		(20)
Other comprehensive income (loss), net of tax	(762)							(742)
Common Stock issued under employee plans	281	262	9		10
Common Stock repurchased	2,254	(998)	3,252
Dividends on Common Stock	2,069			2,069
Dividends on ESOP Common Stock	74			74
Dividends attributable to noncontrolling interest	345						345
Purchase of subsidiary shares from noncontrolling interest	9	8					1
Sale of subsidiary shares in noncontrolling interest	25						25
Acquisition of noncontrolling interest	98						98
Redeemable noncontrolling interest fair value adjustment	(1)			(1)
Redeemable noncontrolling interest reclassification to noncontrolling interest	(12)						(12)		12
Other	7			6			1		(8)
Redeemable noncontrolling interest in subsidiaries' earning	6						6		(6)
Dividends attributable to noncontrolling interest - RNCI									(2)
Purchase of subsidiary shares from noncontrolling interest - RNCI									(4)
Acquisition of noncontrolling interest - RNCI									189
Redeemable noncontrolling interest fair value adjustment - RNCI									1
Shareowners' Equity	27,579	17,285	(34,150)	52,873	(95)	(8,334)
Noncontrolling interest	1,590						1,590
Total Equity	29,169
Redeemable Noncontrolling Interest									296
Net Income - Retained Earnings	4,552			4,552
Net Income - NCI							(368)
Net income	4,920
Other comprehensive income (loss), net of tax - AOCI						809
Other comprehensive income (loss), net of tax - NCI							(56)		24
Other comprehensive income (loss), net of tax	889							$ 865
Common Stock issued under employee plans	348	331	7		10
Common Stock repurchased	1,452	(1)	1,453
Dividends on Common Stock	2,074			2,074
Dividends on ESOP Common Stock	72			72
Dividends attributable to noncontrolling interest	336						336
Purchase of subsidiary shares from noncontrolling interest	4	(4)					8
Sale of subsidiary shares in noncontrolling interest	8						8
Acquisition of noncontrolling interest	14						14
Redeemable noncontrolling interest fair value adjustment	(89)	(47)		(42)
Other	(141)			5			(136)
Redeemable noncontrolling interest in subsidiaries' earning	17						17		(17)
Dividends attributable to noncontrolling interest - RNCI									(7)
Purchase of subsidiary shares from noncontrolling interest - RNCI									(288)
Redeemable noncontrolling interest fair value adjustment - RNCI									89
Shareowners' Equity	29,610	$ 17,574	$ (35,596)	$ 55,242	$ (85)	$ (7,525)
Noncontrolling interest	1,811						$ 1,811
Total Equity	$ 31,421
Redeemable Noncontrolling Interest									$ 131

Consolidated Statement of Changes in Equity (Parenthetical) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Common Stock issued under employee plans, shares	3.2	2.5	3.7
Tax benefit from Common Stock issued under employee plans			$ 64
Common Stock repurchased, shares	12.9	32.3	88.7
Stock Issued During Period, Shares, Other			11.3
Stock Issued During Period, Shares, Employee Benefit Plan			2.7

Summary of Accounting Principles

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Summary of Accounting Principles

SUMMARY OF ACCOUNTING PRINCIPLES

The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. Actual results could differ from those estimates. Certain reclassifications have been made to the prior year amounts to conform to the current year presentation.

Consolidation. The Consolidated Financial Statements include the accounts of United Technologies Corporation (UTC) and its controlled subsidiaries. Intercompany transactions have been eliminated.

Cash and Cash Equivalents. Cash and cash equivalents includes cash on hand, demand deposits and short-term cash investments that are highly liquid in nature and have original maturities of three months or less.

On occasion, we are required to maintain cash deposits with certain banks with respect to contractual obligations related to acquisitions or divestitures or other legal obligations. As of December 31, 2017 and 2016, the amount of such restricted cash was approximately $33 million and $32 million, respectively.

Accounts Receivable. Current and long-term accounts receivable as of December 31, 2017 include retainage of $118 million and unbilled receivables of $2,770 million, which includes approximately $1,109 million of unbilled receivables under commercial aerospace long-term aftermarket contracts. Current and long-term accounts receivable as of December 31, 2016 include retainage of $106 million and unbilled receivables of $2,786 million, which includes approximately $1,169 million of unbilled receivables under commercial aerospace long-term aftermarket contracts. See Note 5 for discussion of commercial aerospace industry assets and commitments.

Retainage represents amounts that, pursuant to the applicable contract, are not due until project completion and acceptance by the customer. Unbilled receivables represent revenues that are not currently billable to the customer under the terms of the contract. These items are expected to be billed and collected in the normal course of business.

Marketable Equity Securities. Equity securities that have a readily determinable fair value and that we do not intend to trade are classified as available-for-sale and carried at fair value. Unrealized holding gains and losses are recorded as a separate component of shareowners' equity, net of deferred income taxes.

In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU modifies how entities measure equity investments and present changes in the fair value of financial liabilities. Upon adoption, investments that do not result in consolidation and are not accounted for under the equity method generally must be carried at fair value, with changes in fair value recognized in net income. As discussed in Note 10, we have approximately $5 million of unrealized gains on these securities recorded in Accumulated other comprehensive loss in our Consolidated Balance Sheet as of December 31, 2017. We adopted this standard effective January 1, 2018, with these amounts recorded directly to retained earnings as of that date.

Inventories and Contracts in Progress. Inventories and contracts in progress are stated at the lower of cost or estimated realizable value and are primarily based on first-in, first-out (FIFO) or average cost methods; however, certain UTC Aerospace Systems and UTC Climate, Controls & Security entities use the last-in, first-out (LIFO) method. If inventories that were valued using the LIFO method had been valued under the FIFO method, they would have been higher by $106 million and $114 million at December 31, 2017 and 2016, respectively.

Costs accumulated against specific contracts or orders are at actual cost. Valuation reserves for excess, obsolete, and slow-moving inventory are estimated by comparing the inventory levels of individual parts to both future sales forecasts or production requirements and historical usage rates in order to identify inventory where the resale value or replacement value is less than inventoriable cost. Other factors that management considers in determining the adequacy of these reserves include whether individual inventory parts meet current specifications and cannot be substituted for a part currently being sold or used as a service part, overall market conditions, and other inventory management initiatives. Manufacturing costs are allocated to current production and firm contracts. Within commercial aerospace, inventory costs attributable to new engine offerings are recognized based on the average cost per unit expected over the life of each contract using the units-of-delivery method of percentage of completion accounting. Under this method, costs of initial engine deliveries in excess of the projected contract per unit average cost are capitalized, and these capitalized amounts are subsequently expensed as additional engine deliveries occur for engines with costs below the projected contract per unit average cost over the life of the contract. As described in the "Revenue Recognition" section of Note 1 below, these costs will be eliminated through retained earnings and will not be amortized into future earnings upon adoption of Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers effective January 1, 2018.

Equity Method Investments. Investments in which we have the ability to exercise significant influence, but do not control, are accounted for under the equity method of accounting and are included in Other assets on the Consolidated Balance Sheet. Under this method of accounting, our share of the net earnings or losses of the investee is included in Other income, net on the Consolidated Statement of Operations since the activities of the investee are closely aligned with the operations of the business segment holding the investment. We evaluate our equity method investments whenever events or changes in circumstance indicate that the carrying amounts of such investments may be impaired. If a decline in the value of an equity method investment is determined to be other than temporary, a loss is recorded in earnings in the current period.

Goodwill and Intangible Assets. Goodwill represents costs in excess of fair values assigned to the underlying net assets of acquired businesses. Goodwill and intangible assets deemed to have indefinite lives are not amortized. Goodwill and indefinite‑lived intangible assets are subject to annual impairment testing using the guidance and criteria described in the Intangibles - Goodwill and Other Topic of the FASB ASC. This testing compares carrying values to fair values and, when appropriate, the carrying value of these assets is reduced to fair value.

In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 of the current goodwill impairment test, which requires a hypothetical purchase price allocation to measure goodwill impairment. A goodwill impairment loss will instead be measured at the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the recorded amount of goodwill. The provisions of this ASU are effective for years beginning after December 15, 2019, with early adoption permitted for any impairment test performed on testing dates after January 1, 2017. We early adopted this standard as of July 1, 2017 and this ASU did not have a significant impact on our financial statements or disclosures.

Intangible assets consist of service portfolios, patents, trademarks/tradenames, customer relationships and other intangible assets including a collaboration asset, as discussed further in Note 2. Acquired intangible assets are recognized at fair value in purchase accounting and then amortized to cost of sales and selling, general & administrative expenses over the applicable useful lives. Also included within other intangible assets are commercial aerospace payments made to secure certain contractual rights to provide product on new aircraft platforms. We classify amortization of such payments as a reduction of sales. Such payments are capitalized when there are distinct rights obtained and there are sufficient incremental cash flows to support the recoverability of the assets established. Otherwise, the applicable portion of the payments are expensed. Consideration paid on these contractual commitments is capitalized when it is no longer conditional.

Useful lives of finite-lived intangible assets are estimated based upon the nature of the intangible asset and the industry in which the intangible asset is used. These intangible assets are amortized based on the pattern in which the economic benefits of the intangible assets are consumed. For both our commercial aerospace collaboration assets and exclusivity arrangements, the pattern of economic benefit generally results in lower amortization during the development period with increasing amortization as programs enter full rate production and aftermarket cycles. If a pattern of economic benefit cannot be reliably determined, a straight-line amortization method is used. The range of estimated useful lives is as follows:



Collaboration assets	30 years
Customer relationships and related programs	1 to 50 years
Purchased service contracts	5 to 25 years
Patents & trademarks	4 to 40 years
Exclusivity assets	5 to 25 years

Other Long-Lived Assets. We evaluate the potential impairment of other long-lived assets whenever events or changes in circumstances indicate that the related carrying amounts may not be recoverable. If the carrying value of other long-lived assets held and used exceeds the sum of the undiscounted expected future cash flows, the carrying value is written down to fair value.

Long-Term Financing Receivables. Our long-term financing receivables primarily represent balances related to the aerospace businesses such as long-term trade accounts receivable, leases, and notes receivable. We also have other long-term receivables in our commercial businesses; however, both the individual and aggregate amounts of those other receivables are not significant.

Long-term trade accounts receivable, including unbilled receivables related to long-term aftermarket contracts, are principally amounts arising from the sale of goods and services with a contractual maturity date or realization period of greater than one year and are recognized as "Other assets" in our Consolidated Balance Sheet. Notes and leases receivable represent notes and lease receivables other than receivables related to operating leases, and are recognized as "Customer financing assets" in our Consolidated Balance Sheet. The following table summarizes the balance by class of aerospace business-related long-term receivables as of December 31, 2017 and 2016:



(dollars in millions)	2017		2016
Long-term trade accounts receivable	$	973	$	926
Notes and leases receivable	424		430
Total long-term receivables	$	1,397	$	1,356

We determine a receivable is impaired when, based on current information and events, it is probable that we will be unable to collect amounts due according to the contractual terms of the receivable agreement. Factors considered in assessing collectability and risk include, but are not limited to, examination of credit quality indicators and other evaluation measures, underlying value of any collateral or security interests, significant past due balances, historical losses, and existing economic conditions.

We determine credit ratings for each customer in our portfolio based upon public information and information obtained directly from our customers. We conduct a review of customer credit ratings, published historical credit default rates for different rating categories, and multiple third-party aircraft value publications as a basis to validate the reasonableness of the allowance for losses on these balances quarterly or when events and circumstances warrant. Customer credit ratings range from customers with an extremely strong capacity to meet financial obligations, to customers whose uncollateralized receivable is in default. There can be no assurance that actual results will not differ from estimates or that consideration of these factors in the future will not result in an increase or decrease to the allowance for credit losses on long-term receivables. Based upon the customer credit ratings, approximately 11% and 13% of our long-term receivables were considered to bear high credit risk as of December 31, 2017 and 2016, respectively. See Note 5 for further discussion of commercial aerospace industry assets and commitments.

Reserves for credit losses on receivables relate to specifically identified receivables that are evaluated individually for impairment. For notes and leases receivable, we determine a specific reserve for exposure based on the difference between the carrying value of the receivable and the estimated fair value of the related collateral in connection with the evaluation of credit risk and collectability. For long-term trade accounts receivable, we evaluate credit risk and collectability individually to determine if an allowance is necessary. Our long-term receivables reflected in the table above, which include reserves of $17 million as of both December 31, 2017 and 2016, are individually evaluated for impairment. At both December 31, 2017 and 2016, we did not have any significant balances that are considered to be delinquent, on non-accrual status, past due 90 days or more, or considered to be impaired.

Income Taxes. In the ordinary course of business there is inherent uncertainty in quantifying our income tax positions. We assess our income tax positions and record tax benefits for all years subject to examination based upon management's evaluation of the facts, circumstances, and information available at the reporting date. For those tax positions where it is more-likely-than-not that a tax benefit will be sustained, we have recorded the largest amount of tax benefit with a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. For those income tax positions where it is not more-likely-than-not that a tax benefit will be sustained, no tax benefit has been recognized in the financial statements. Where applicable, associated interest expense has also been recognized. We recognize accrued interest related to unrecognized tax benefits in interest expense. Penalties, if incurred, would be recognized as a component of income tax expense.

On December 22, 2017 the TCJA was enacted. The TCJA contains a new law that may subject the Company to a tax on Global Intangible Low-Taxed Income (GILTI), beginning in 2018. GILTI is a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The FASB has provided that companies subject to GILTI have the option to account for the GILTI tax as a period cost if and when incurred, or to recognize deferred taxes for temporary differences, including outside basis differences, expected to reverse as GILTI. We have elected to account for GILTI as a period cost, if incurred.

Revenue Recognition. As a result of our diverse product and service mix and customer base, we use multiple revenue recognition practices. We recognize sales for products and services in accordance with the provisions of Staff Accounting Bulletin (SAB) Topic 13, Revenue Recognition, as applicable. Products and services included within the scope of this SAB Topic include heating, ventilating, air-conditioning and refrigeration systems, certain alarm and fire detection and suppression systems, commercially funded research and development contracts and certain aerospace components. Sales within the scope of this SAB Topic are recognized when persuasive evidence of an arrangement exists, product delivery has occurred or services have been rendered, pricing is fixed or determinable and collectability is reasonably assured. Subsequent changes in service contracts are accounted for prospectively.

Contract Accounting and Separately Priced Maintenance and Extended Warranty Aftermarket Contracts: For our construction-type and certain production-type contracts, sales are recognized on a percentage-of-completion basis following contract accounting methods. Contracts consist of enforceable agreements which form the basis of our unit of accounting for measuring sales, accumulating costs and recording loss provisions as necessary. Contract accounting requires estimates of award fees and other sources of variable consideration as well as future costs over the performance period of the contract. Cost estimates also include the estimated cost of satisfying our offset obligations required under certain contracts. Cost estimates are subject to change and result in adjustments to margins on contracts in progress. The extent of progress toward completion on our long-term commercial aerospace equipment is measured using units of delivery or other contractual milestones. The extent of progress towards completion on our development and other cost reimbursement contracts in our aerospace businesses and elevator and escalator sales, installation, modernization and other construction contracts in our commercial businesses is measured using cost-to-cost based input measures. Contract costs include estimated inventoriable manufacturing, engineering, product warranty and product performance guarantee costs, as appropriate.

For separately priced product maintenance and extended warranty aftermarket contracts, sales are recognized over the contract period. In the commercial businesses, sales are primarily recognized on a straight-line basis. In the aerospace businesses, sales are primarily recognized in proportion to cost as sufficient historical evidence indicates that costs of performing services under the contract are incurred on an other than straight-line basis.

Loss provisions on original equipment contracts are recognized to the extent that estimated contract costs exceed the estimated consideration from the products contemplated under the contractual arrangement. For new commitments, we generally record loss provisions at the earlier of contract announcement or contract signing except for certain requirements contracts under which losses are recorded upon receipt of the purchase order which obligates us to perform. For existing commitments, anticipated losses on contracts are recognized in the period in which losses become evident. Products contemplated under contractual arrangements include firm quantities of products sold under contract and, in the large commercial engine and wheels and brakes businesses, future highly probable sales of replacement parts required by regulation that are expected to be sold subsequently for incorporation into the original equipment. In the large commercial engine and wheels and brakes businesses, when the combined original equipment and aftermarket arrangements for each individual sales campaign are profitable, we record original equipment product losses, as applicable, at the time of delivery.

We review our cost estimates on significant contracts on a quarterly basis, and for others, no less frequently than annually or when circumstances change and warrant a modification to a previous estimate. We record changes in contract estimates using the cumulative catch-up method in accordance with the Revenue Recognition Topic of the FASB ASC. Operating profits included significant net unfavorable changes in aerospace contract estimates of approximately $110 million and $157 million in 2017 and 2016, respectively, primarily the result of unexpected increases in estimated costs related to Pratt & Whitney long term aftermarket contracts. Operating profits included significant net favorable changes in aerospace contract estimates of approximately $115 million in 2015, primarily representing favorable contract adjustments at Pratt & Whitney.

Collaborations: Sales generated from engine programs, spare parts sales, and aftermarket business under collaboration arrangements are recorded consistent with our revenue recognition policies in our consolidated financial statements. Amounts attributable to our collaborators for their share of sales are recorded as cost of sales in our financial statements based upon the terms and nature of the arrangement. Costs associated with engine programs under collaborative arrangements are expensed as incurred. Under these arrangements, collaborators contribute their program share of engine parts, incur their own production costs and make certain payments to Pratt & Whitney for shared or joint program costs. The reimbursement of a collaborator's share of program costs is recorded as a reduction of the related expense item at that time.

Cash Payments to Customers: UTC Climate, Controls & Security customarily offers its customers incentives to purchase products to ensure an adequate supply of its products in the distribution channels. The principal incentive program provides reimbursements to distributors for offering promotional pricing for our products. We account for incentive payments made as a reduction in sales. In our aerospace businesses, we may make participation payments to certain customers to secure certain contractual rights. To the extent these rights are incremental and are supported by the incremental cash flows obtained, they are capitalized as intangible assets. Otherwise, such payments are expensed. We classify the subsequent amortization of the capitalized acquired intangible assets from our customers as a reduction in sales. Contractually stated prices in arrangements with our customers that include the acquisition of intangible rights within the scope of the Intangibles - Goodwill and Other Topic of the FASB ASC and deliverables within the scope of the Revenue Recognition Topic of the FASB ASC are not presumed to be representative of fair value for determining the amounts to allocate to each element of an arrangement.

Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers: In May 2014, the FASB issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers. In 2015 and 2016, the FASB issued various updates to this ASU as follows:


•	ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date - delays the effective date of ASU 2014-09 by one year.


•	ASU 2016-08, Revenue from Contracts with Customers (Topic 606), Principal versus Agent Considerations (Reporting Revenue Gross versus Net) - clarifies how an entity should identify the unit of accounting (i.e. the specified good or service) for the principal versus agent evaluation and how it should apply the control principle to certain types of arrangements.


•	ASU 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing - clarifies the guidance surrounding licensing arrangements and the identification of performance obligations.


•	ASU 2016-12, Revenue from Contracts with Customers (Topic 606), Narrow-Scope Improvements and Practical Expedients - addresses implementation issues raised by stakeholders concerning collectability, noncash consideration, presentation of sales tax, and transition.


•	ASU 2016-20, Revenue from Contracts with Customers (Topic 606), Technical Corrections and Improvements - addresses loan guarantee fees, impairment testing of contract costs, provisions for losses on certain contracts, and various disclosures.

ASU 2014-09 and its related amendments (collectively, the New Revenue Standard) are effective for reporting periods beginning after December 15, 2017, and interim periods therein. In accordance with the standard, we have adopted the New Revenue Standard effective January 1, 2018 and elected the modified retrospective approach with the cumulative effect of adoption recognized through retained earnings at the date of adoption.

The New Revenue Standard will change the revenue recognition practices for a number of revenue streams across our businesses, although the most significant impacts will be concentrated within our aerospace units. Several businesses, which currently account for revenue on an output units of delivery basis will be required to use an input method of an “over time” model as they meet one or more of the mandatory criteria established in the New Revenue Standard. Revenue will now be recognized based on percentage-of-completion for repair contracts within Otis and UTC Climate, Controls & Security; certain U.S. Government aerospace contracts; and aerospace aftermarket service work. For these businesses, unrecognized sales and operating profits related to the satisfied portion of the performance obligations of contracts in process as of the date of adoption will be recorded through retained earnings. While we are still finalizing our retained earnings impact evaluation, the ongoing effect of recognizing revenue on an input method of an over time model within these businesses is not expected to be material.

In addition to the foregoing, our aerospace businesses will also incur changes related to the timing of manufacturing cost recognition and certain engineering and development costs. In most circumstances, our commercial aerospace businesses will identify the performance obligation, or the unit of accounting, as the individual original equipment (OEM) unit; revenues and costs to manufacture each unit will be recognized upon OEM unit delivery. Generally under current practice, the unit of accounting is the contract, and early-contract OEM unit costs in excess of the average expected over the contract are capitalized and amortized over lower-cost units later in the contract. With the adoption of the New Revenue Standard, deferred unit costs in excess of the contract average of $438 million as of December 31, 2017 will be eliminated through retained earnings and will not be amortized into future earnings.

With regard to costs incurred for the engineering and development of aerospace products under contract with customers, we generally expense as incurred unless there is a contractually guaranteed right of recovery. The New Revenue Standard requires product engineering and development costs to be capitalized as contract fulfillment costs, to the extent recoverable from the associated contract margin, and subsequently amortized as the OEM products are delivered to the customer. We are still finalizing the calculation of the impact of this change to our adoption-date retained earnings. The ongoing impact will not change the total amount of cost incurred, but will change the timing of recognition of that cost.

Prior to the New Revenue Standard, any customer funding received for such development efforts was recognized when earned, with the corresponding costs recognized as cost of sales. The New Revenue Standard requires customer funding of OEM product engineering and development to be deferred and recognized as revenue as the OEM products are delivered to the customer. For contracts that are open as of the adoption date, previously recognized customer funding will be established as a contract liability as deferred income. We are still finalizing the calculation of the impact of this change to our adoption-date retained earnings.

We expect the New Revenue Standard will have an immaterial impact on our 2018 net income. Adoption of the New Revenue Standard will result in income statement classification changes between Revenues, Cost of sales, Research & development, and Other income. The New Revenue Standard will also result in the establishment of Contract asset and Contract liability balance sheet accounts, and in the reclassification to these new accounts from Accounts receivable; Inventories and contracts in progress, net; and Accrued liabilities. The New Revenue Standard requires ongoing incremental disclosures including explanation of significant changes in the Contract asset and Contract liability balances, and disaggregation of revenue into categories that depict how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors.

The New Revenue Standard also requires disclosure of remaining performance obligations, which is a concept that is similar to that of backlog, which we report in Item I, Part I of our Form 10-K. Beginning in 2018, we will align our definition of backlog with that of remaining performance obligations under the New Revenue Standard. We have historically included in backlog engine orders from airlines for which such purchase orders have not yet been received. Effective with the adoption of the New Revenue Standard, we will no longer include in backlog airline engine orders for which we have not yet received the associated firm manufacturing purchase order. Excluding these engine orders is expected to result in a significant decline in reported backlog in 2018.

Research and Development. Research and development costs not specifically covered by contracts and those related to the company sponsored share of research and development activity in connection with cost-sharing arrangements are charged to expense as incurred. Government research and development support, not associated with specific contracts, is recorded as a reduction to research and development expense in the period earned. See Note 8 for a discussion of amendments of certain government research and development support arrangements concluded in December 2015 between P&WC and the Canadian government.

Research and development costs incurred under contracts with customers are included as a contract cost and reported as a component of cost of products sold when revenue from such contracts is recognized. Research and development costs in excess of contractual consideration are expensed as incurred.

Foreign Exchange. We conduct business in many different currencies and, accordingly, are subject to the inherent risks associated with foreign exchange rate movements. The financial position and results of operations of substantially all of our foreign subsidiaries are measured using the local currency as the functional currency. Foreign currency denominated assets and liabilities are translated into U.S. Dollars at the exchange rates existing at the respective balance sheet dates, and income and expense items are translated at the average exchange rates during the respective periods. The aggregate effects of translating the balance sheets of these subsidiaries are deferred as a separate component of shareowners' equity.

Derivatives and Hedging Activity. We have used derivative instruments, including swaps, forward contracts and options, to help manage certain foreign currency, interest rate and commodity price exposures. Derivative instruments are viewed as risk management tools by us and are not used for trading or speculative purposes. By their nature, all financial instruments involve market and credit risks. We enter into derivative and other financial instruments with major investment grade financial institutions and have policies to monitor the credit risk of those counterparties. We limit counterparty exposure and concentration of risk by diversifying counterparties. While there can be no assurance, we do not anticipate any material non-performance by any of these counterparties. We enter into transactions that are subject to enforceable master netting arrangements or similar agreements with various counterparties. However, we have not elected to offset multiple contracts with a single counterparty and, as a result, the fair value of the derivative instruments in a loss position is not offset against the fair value of derivative instruments in a gain position.

Derivatives used for hedging purposes may be designated and effective as a hedge of the identified risk exposure at the inception of the contract. All derivative instruments are recorded on the balance sheet at fair value. Derivatives used to hedge foreign-currency denominated balance sheet items are reported directly in earnings along with offsetting transaction gains and losses on the items being hedged. Derivatives used to hedge forecasted cash flows associated with foreign currency commitments or forecasted commodity purchases may be accounted for as cash flow hedges, as deemed appropriate. Gains and losses on derivatives designated as cash flow hedges are recorded in other comprehensive income and reclassified to earnings as a component of product sales or expenses, as applicable, when the hedged transaction occurs. To the extent that a previously designated hedging transaction is no longer an effective hedge, any ineffectiveness measured in the hedging relationship is recorded currently in earnings in the period it occurs. As discussed in Note 14, at December 31, 2017 we have approximately €3.7 billion of Euro-denominated long-term debt, which qualify as a net investment hedge against our investments in European businesses. We had no Euro-denominated commercial paper borrowings outstanding at December 31, 2017.

To the extent the hedge accounting criteria are not met, the foreign currency forward contracts are utilized as economic hedges and changes in the fair value of these contracts are recorded currently in earnings in the period in which they occur. Additional information pertaining to foreign currency forward contracts and net investment hedging is included in Note 14.

Environmental. Environmental investigatory, remediation, operating and maintenance costs are accrued when it is probable that a liability has been incurred and the amount can be reasonably estimated. The most likely cost to be incurred is accrued based on an evaluation of currently available facts with respect to each individual site, including existing technology, current laws and regulations and prior remediation experience. Where no amount within a range of estimates is more likely, the minimum is accrued. For sites with multiple responsible parties, we consider our likely proportionate share of the anticipated remediation costs and the ability of the other parties to fulfill their obligations in establishing a provision for those costs. Liabilities with fixed or reliably determinable future cash payments are discounted. Accrued environmental liabilities are not reduced by potential insurance reimbursements. See Note 18 for additional details on the environmental remediation activities.

Pension and Postretirement Obligations. Guidance under the Compensation - Retirement Benefits Topic of the FASB ASC requires balance sheet recognition of the overfunded or underfunded status of pension and postretirement benefit plans. Under this guidance, actuarial gains and losses, prior service costs or credits, and any remaining transition assets or obligations that have not been recognized under previous accounting standards must be recognized in other comprehensive income, net of tax effects, until they are amortized as a component of net periodic benefit cost.

In March 2017, the FASB issued ASU 2017-07, Compensation—Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This ASU requires an employer to report the service cost component of net periodic pension benefit cost in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period, with other cost components presented separately from the service cost component and outside of income from operations. This ASU also allows only the service cost component of net periodic pension benefit cost to be eligible for capitalization when applicable. The provisions of this ASU are effective for years beginning after December 15, 2017, and we adopted the new standard effective January 1, 2018. Provisions related to presentation of the service cost components versus other cost components must be applied retrospectively, while provisions related to service cost component eligibility for capitalization must be applied prospectively. This ASU primarily impacts the presentation of net periodic pension cost/benefit and therefore we do not expect this ASU to have a material impact on net income; however, it will result in changes to reported operating profit.

Product Performance Obligations. We extend performance and operating cost guarantees beyond our normal service and warranty policies for extended periods on some of our products, particularly commercial aircraft engines. Liability under such guarantees is based upon future product performance and durability. We accrue for such costs that are probable and can be reasonably estimated. In addition, we incur discretionary costs to service our products in connection with product performance issues. The costs associated with these product performance and operating cost guarantees require estimates over the full terms of the agreements, and require management to consider factors such as the extent of future maintenance requirements and the future cost of material and labor to perform the services. These cost estimates are largely based upon historical experience. See Note 17 for further discussion.

Collaborative Arrangements. In view of the risks and costs associated with developing new engines, Pratt & Whitney has entered into certain collaboration arrangements in which sales, costs and risks are shared. Sales generated from engine programs, spare parts, and aftermarket business under collaboration arrangements are recorded as earned in our financial statements. Amounts attributable to our collaborators for their share of sales are recorded as an expense in our financial statements based upon the terms and nature of the arrangement. Costs associated with engine programs under collaborative arrangements are expensed as incurred. Under these arrangements, collaborators contribute their program share of engine parts, incur their own production costs and make certain payments to Pratt & Whitney for shared or joint program costs. The reimbursement of the collaborators' share of program costs is recorded as a reduction of the related expense item at that time. As of December 31, 2017, the collaborators' interests in all commercial engine programs ranged from 14% to 50%, inclusive of a portion of Pratt & Whitney's interests held by other participants. Pratt & Whitney is the principal participant in all existing collaborative arrangements, with the exception of the Engine Alliance (EA), a joint venture with GE Aviation, which markets and manufactures the GP7000 engine for the Airbus A380 aircraft. There are no individually significant collaborative arrangements and none of the collaborators exceed a 31% share in an individual program. The following table illustrates the income statement classification and amounts attributable to transactions arising from the collaborative arrangements between participants for each period presented. Selling, general and administrative amounts for 2016 and 2015 have been revised to present these amounts on a basis consistent with 2017 presentation.



(dollars in millions)	2017			2016			2015
Collaborator share of sales:
Cost of products sold	$	1,789		$	1,700		$	1,547
Cost of services sold	929			675			652
Collaborator share of program costs (reimbursement of expenses incurred):
Cost of products sold	(143		)	(108		)	(104		)
Research and development	(190		)	(184		)	(248		)
Selling, general and administrative	(74		)	(57		)	(53		)

Accounting Pronouncements. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. This ASU requires the income tax consequences of an intra-entity transfer of an asset, other than inventory, to be recognized when the transfer occurs. Two common examples of assets included in the scope of this update are intellectual property and property, plant, and equipment. The provisions of this ASU are effective for years beginning after December 15, 2017, with early adoption permitted. We do not expect this ASU to have a significant impact on our financial statements or disclosures. We adopted the new standard effective January 1, 2018.

In February 2016, the FASB issued ASU 2016- 02, Leases (Topic 842). The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the Consolidated Statement of Operations. In addition, this standard requires a lessor to classify leases as either sales-type, finance or operating. A lease will be treated as a sale if it transfers all of the risks and rewards, as well as control of the underlying asset, to the lessee. If risks and rewards are conveyed without the transfer of control, the lease is treated as financing. If the lessor doesn’t convey risks and rewards or control, the lease is treated as operating.

The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases and lessors for sales-type, direct financing, and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. In November 2017, the FASB announced a decision to offer an additional practical expedient related to the transition to the new lease accounting standard which allows for its prospective adoption. The FASB is expected to formally communicate this new practical expedient through an Accounting Standards Update to be released in early 2018. While we are still evaluating the impact of our pending adoption of the new standard on our consolidated financial statements, we expect that upon adoption we will recognize ROU assets and lease liabilities and that the amounts could be material. We do not expect the ASU to have a material impact on our cash flows or results of operations.

In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. This ASU provides a new framework that will assist in the evaluation of whether business combination transactions should be accounted for as an acquisition of a business or as a group of assets, and specifies the minimum required inputs and processes necessary to be a business. The provisions of this ASU are effective for years beginning after December 15, 2017, with early adoption permitted. We adopted the new standard effective January 1, 2018.

In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU provides that an entity should account for the effects of a modification unless the fair value, the vesting conditions of the modified award and the classification of the modified award (equity or liability instrument) are the same as the original award immediately before the modification. The provisions of this ASU are effective for years beginning after December 15, 2017, with early adoption permitted. We do not expect this ASU to have a significant impact on our financial statements or disclosures. We adopted the new standard effective January 1, 2018.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This ASU will make more financial and nonfinancial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. It is intended to more closely align hedge accounting with a company’s risk management strategies, simplify the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. The provisions of this ASU are effective for years beginning after December 15, 2018, with early adoption permitted for any interim period after issuance of the ASU. We do not expect this ASU to have a significant impact on our results of operations or financial position. We adopted the new standard effective January 1, 2018.

Business Acquisitions, Dispositions, Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2017

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]

Note 2: Business Acquisitions, Dispositions, Goodwill and Intangible Assets

BUSINESS ACQUISITIONS, DISPOSITIONS, GOODWILL AND INTANGIBLE ASSETS

Business Acquisitions and Dispositions. Our investments in businesses in 2017, 2016 and 2015 totaled $231 million, $712 million (including debt assumed of $2 million) and $556 million (including debt assumed of $18 million), respectively. Our investments in businesses in 2017 consisted of a number of small acquisitions, primarily in our commercial businesses. Our investments in businesses in 2016 consisted of the acquisition of a majority interest in an Italian heating products and services company by UTC Climate, Controls & Security, the acquisition of a Japanese services company by Otis and a number of small acquisitions, primarily in our commercial businesses. Our investments in businesses in 2015 consisted of the acquisition of the majority interest in a UTC Climate, Controls & Security business, the acquisition of an imaging technology company by UTC Aerospace Systems, and a number of small acquisitions, primarily in our commercial businesses.

On September 4, 2017, we announced that we had entered into a merger agreement with Rockwell Collins, Inc. (Rockwell Collins), under which we agreed to acquire Rockwell Collins. Under the terms of the merger agreement, each Rockwell Collins shareowner will receive $93.33 per share in cash and a fraction of a share of UTC common stock equal to the quotient obtained by dividing $46.67 by the average of the volume-weighted average prices per share of UTC common stock on the NYSE on each of the 20 consecutive trading days ending with the trading day immediately prior to the closing date, (the “UTC Stock Price”), subject to adjustment based on a two-way collar mechanism as described below (the “Stock Consideration”). The cash and UTC stock payable in exchange for each such share of Rockwell Collins common stock are collectively the “Merger Consideration.” The fraction of a share of UTC common stock into which each such share of Rockwell Collins common stock will be converted is the “Exchange Ratio.” The Exchange Ratio will be determined based upon the UTC Stock Price. If the UTC Stock Price is greater than $107.01 but less than $124.37, the Exchange Ratio will be equal to the quotient of (i) $46.67 divided by (ii) the UTC Stock Price, which, in each case, will result in the Stock Consideration having a value equal to $46.67. If the UTC Stock Price is less than or equal to $107.01 or greater than or equal to $124.37, then a two-way collar mechanism will apply, pursuant to which, (x) if the UTC Stock Price is greater than or equal to $124.37, the Exchange Ratio will be fixed at 0.37525 and the value of the Stock Consideration will be greater than $46.67, and (y) if the UTC Stock Price is less than or equal to $107.01, the Exchange Ratio will be fixed at 0.43613 and the value of the Stock Consideration will be less than $46.67. On January 11, 2018, the merger was approved by Rockwell Collins' shareowners. We currently expect that the merger will be completed in the third quarter of 2018, subject to customary closing conditions, including the receipt of required regulatory approvals.

We anticipate that approximately $15 billion will be required to pay the aggregate cash portion of the Merger Consideration. We expect to fund the cash portion of the Merger Consideration through debt issuances and cash on hand. Additionally, we have entered into a $6.5 billion 364-day unsecured bridge loan credit agreement that would be funded only to the extent certain anticipated debt issuances are not completed prior to the completion of the merger. We expect to assume approximately $7 billion of Rockwell Collins' outstanding debt upon completion of the merger.

As discussed further in Note 3, on November 6, 2015, we completed the sale of Sikorsky to Lockheed Martin Corp. for approximately $9.1 billion in cash.

Goodwill. The changes in the carrying amount of goodwill, by segment, in 2017 are as follows:



(dollars in millions)	Balance as of January 1, 2017		Goodwill resulting from business combinations		Foreign currency translation and other		Balance as of December 31, 2017
Otis	$	1,575	$	28	$	134	$	1,737
UTC Climate, Controls & Security	9,487		130		392		10,009
Pratt & Whitney	1,511		—		—		1,511
UTC Aerospace Systems	14,483		—		167		14,650
Total Segments	27,056		158		693		27,907
Eliminations and other	3		—		—		3
Total	$	27,059	$	158	$	693	$	27,910

Intangible Assets. Identifiable intangible assets are comprised of the following:



	2017					2016
(dollars in millions)	Gross Amount		Accumulated Amortization			Gross Amount		Accumulated Amortization
Amortized:
Service portfolios	$	2,178	$	(1,534	)	$	1,995	$	(1,344	)
Patents and trademarks	399		(233		)	378		(201		)
Collaboration intangible assets	4,109		(384		)	3,724		(211		)
Customer relationships and other	13,352		(4,100		)	12,798		(3,480		)
	20,038		(6,251		)	18,895		(5,236		)
Unamortized:
Trademarks and other	2,096		—			2,025		—
Total	$	22,134	$	(6,251	)	$	20,920	$	(5,236	)

Customer relationship intangible assets include payments made to our customers to secure certain contractual rights. Such payments are capitalized when distinct rights are obtained and sufficient incremental cash flows to support the recoverability of the assets have been established. Otherwise, the applicable portion of the payments is expensed. We amortize these intangible assets based on the underlying pattern of economic benefit, which may result in an amortization method other than straight-line. In the aerospace industry, amortization based on the pattern of economic benefit generally results in lower amortization expense during the development period with amortization expense increasing as programs enter full production and aftermarket cycles. If a pattern of economic benefit cannot be reliably determined, a straight-line amortization method is used. We classify amortization of such payments as a reduction of sales. Amortization of intangible assets was $834 million, $778 million and $722 million in 2017, 2016 and 2015, respectively. The collaboration intangible assets are amortized based upon the pattern of economic benefits as represented by the underlying cash flows. The following is the expected amortization of intangible assets for 2018 through 2022, which reflects the pattern of expected economic benefit on certain aerospace intangible assets:



(dollars in millions)	2018		2019		2020		2021		2022
Amortization expense	$	902	$	869	$	888	$	902	$	895

Discontinued Operations	12 Months Ended
Discontinued Operations	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS On November 6, 2015, we completed the sale of Sikorsky to Lockheed Martin Corp. for $9.1 billion in cash. Accordingly, the results of operations and the cash flows related to Sikorsky have been classified in Discontinued Operations in our Consolidated Statements of Operations, Comprehensive Income and Cash Flows for all periods presented. In 2016, we recognized approximately $13 million of additional gain on the disposal, primarily resulting from the settlement of working capital adjustments. In 2016, we recognized approximately $24 million of income tax expense, including the impacts related to filing Sikorsky's 2015 tax returns. Net cash outflows from discontinued operations of approximately $2.5 billion for the year ended December 31, 2016 were primarily due to the payment of taxes related to the 2015 gain realized on the sale of Sikorsky. UTC and its business segments have historically had sales to Sikorsky and purchases from Sikorsky, in the normal course of business, which were eliminated in consolidation. Net sales to Sikorsky were $138 million and net purchases from Sikorsky included in cost of products and services sold were $25 million for the year ended December 31, 2015.

Earnings Per Share

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Share Text Block

EARNINGS PER SHARE



(dollars in millions, except per share amounts; shares in millions)	2017		2016			2015
Net income attributable to common shareowners:
Net income from continuing operations	$	4,552	$	5,065		$	3,996
Net (loss) income from discontinued operations	—		(10		)	3,612
Net income attributable to common shareowners	$	4,552	$	5,055		$	7,608
Basic weighted average number of shares outstanding	790.0		818.2			872.7
Stock awards	9.1		7.9			10.5
Diluted weighted average number of shares outstanding	799.1		826.1			883.2
Earnings Per Share of Common Stock—Basic:
Net income from continuing operations	$	5.76	$	6.19		$	4.58
Net (loss) income from discontinued operations	—		(0.01		)	4.14
Net income attributable to common shareowners	5.76		6.18			8.72
Earnings Per Share of Common Stock—Diluted:
Net income from continuing operations	$	5.70	$	6.13		$	4.53
Net (loss) income from discontinued operations	—		(0.01		)	4.09
Net income attributable to common shareowners	5.70		6.12			8.61

The computation of diluted earnings per share excludes the effect of the potential exercise of stock awards, including stock appreciation rights and stock options, when the average market price of the common stock is lower than the exercise price of the related stock awards during the period. These outstanding stock awards are not included in the computation of diluted earnings per share because the effect would have been anti-dilutive. For 2017, 2016 and 2015, there were 5.9 million, 14.5 million and 9.7 million anti-dilutive stock awards excluded from the computation, respectively.

Commercial Aerospace Industry Assets and Commitments

12 Months Ended

Dec. 31, 2017

Other Commitments [Abstract]

Commercial Aerospace Industry Assets and Commitments

NOTE 5: COMMERCIAL AEROSPACE INDUSTRY ASSETS AND COMMITMENTS

We have receivables and other financing assets with commercial aerospace industry customers totaling $9,477 million and $7,222 million at December 31, 2017 and 2016, respectively. These include customer financing assets related to commercial aerospace industry customers, consisting of products under lease of $1,913 million and $939 million, and notes and leases receivable of $652 million and $497 million, at December 31, 2017 and 2016, respectively.

Aircraft financing commitments, in the form of debt or lease financing, are provided to commercial aerospace customers. The extent to which the financing commitments will be utilized is not currently known, since customers may be able to obtain more favorable terms from other financing sources. We may also arrange for third-party investors to assume a portion of these commitments. If financing commitments are exercised, debt financing is generally secured by assets with fair market values equal to or exceeding the financed amounts consistent with market terms and conditions. We may also lease aircraft and subsequently sublease the aircraft to customers under long-term non-cancelable operating leases. Our financing commitments with customers are contingent upon maintenance of certain levels of financial condition by the customers.

We have also made residual value and other guarantees related to various commercial aerospace customer financing arrangements. The estimated fair market values of the guaranteed assets equal or exceed the value of the related guarantees, net of existing reserves. We have residual value and other guarantees of $336 million as of December 31, 2017. Refer to Note 17 to the Consolidated Financial Statements for additional discussion on guarantees.

We also have other contractual commitments, including commitments to secure certain contractual rights to provide product on new aircraft platforms, which are included in "Other commercial aerospace commitments" in the table below. Payments made on these contractual commitments are included within other intangible assets and are to be amortized over the term of underlying economic benefit. Our commercial aerospace financing and other contractual commitments as of December 31, 2017 were approximately $15.3 billion. We have entered into certain collaboration arrangements, which may include participation by our collaboration partners in these commitments.

The following is the expected maturity of commercial aerospace industry assets and commitments as of December 31, 2017:



(dollars in millions)	Committed			2018			2019			2020			2021			2022			Thereafter
Notes and leases receivable	$	652		$	211		$	56		$	79		$	38		$	35		$	233
Commercial aerospace financing commitments	$	4,012		$	371		$	678		$	636		$	891		$	783		$	653
Other commercial aerospace commitments	11,270			910			840			684			735			645			7,456
Collaboration partners' share	(5,109		)	(374		)	(402		)	(396		)	(525		)	(491		)	(2,921		)
Total commercial commitments	$	10,173		$	907		$	1,116		$	924		$	1,101		$	937		$	5,188

In connection with our 2012 agreement to acquire Rolls-Royce's ownership and collaboration interests in IAE, additional payments are due to Rolls-Royce contingent upon each hour flown through June 2027 by the V2500-powered aircraft in service as of the acquisition date. These flight hour payments, included in "Other commercial aerospace commitments" in the table above, are being capitalized as collaboration intangible assets.

We have long-term aftermarket maintenance contracts with commercial aerospace industry customers for which revenue is recognized in proportion to actual costs incurred relative to total expected costs to be incurred over the respective contract periods. Billings, however, are typically based on factors such as engine flight hours. The timing differences between the billings and the maintenance costs incurred generates both unbilled receivables and deferred revenues. Unbilled receivables under these long-term aftermarket contracts totaled $1,109 million and $1,169 million at December 31, 2017 and 2016, respectively, and are included in "Accounts receivable" and "Other assets" in the accompanying Consolidated Balance Sheet. Deferred revenues generated totaled $5,048 million and $4,288 million at December 31, 2017 and 2016, respectively, and are included in "Accrued liabilities" and "Other long-term liabilities" in the accompanying Consolidated Balance Sheet.

Reserves related to aerospace receivables and financing assets were $175 million and $173 million at December 31, 2017 and 2016, respectively. Reserves related to financing commitments and guarantees were $23 million and $36 million at December 31, 2017 and 2016, respectively.

In addition, in connection with the 2012 Goodrich acquisition, we recorded assumed liabilities of approximately $2.2 billion related to customer contractual obligations on certain OEM development programs where the expected costs exceeded the expected revenue under contract. These liabilities are being liquidated in accordance with the underlying economic pattern of obligations, as reflected by the net cash outflows incurred on the OEM contracts. Total consumption of the contractual obligations for the years ended December 31, 2017 and 2016 was approximately $217 million and $213 million, respectively. The balance of the contractual obligations at December 31, 2017 was $986 million, with future consumption expected to be as follows: $257 million in 2018, $229 million in 2019, $150 million in 2020, $84 million in 2021, $37 million in 2022 and $229 million thereafter.

Inventories and Contracts in Progress

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventories and Contracts in Progress

INVENTORIES & CONTRACTS IN PROGRESS



(dollars in millions)	2017			2016
Raw materials	$	2,038		$	2,040
Work-in-process	3,366			2,787
Finished goods	3,845			3,305
Contracts in progress	10,205			9,395
	19,454			17,527
Less:
Progress payments, secured by lien, on U.S. Government contracts	(236		)	(130		)
Billings on contracts in progress	(9,337		)	(8,693		)
	$	9,881		$	8,704

Raw materials, work-in-process and finished goods are net of valuation reserves of $1,107 million and $877 million as of December 31, 2017 and 2016, respectively. Contracts in progress principally relate to elevator and escalator contracts and include costs of manufactured components, accumulated installation costs and estimated earnings on incomplete contracts.

Inventories also include capitalized contract development costs related to certain aerospace programs at UTC Aerospace Systems. As of December 31, 2017 and 2016, these capitalized costs were $127 million and $140 million, respectively, which will be liquidated as production units are delivered to customers. Within commercial aerospace, inventory costs attributable to new engine offerings are recognized based on the average cost per unit expected over the life of each contract using the units-of-delivery method of percentage of completion accounting. Under this method, costs of initial engine deliveries in excess of the projected contract per unit average cost are capitalized, and these capitalized amounts are subsequently expensed as additional engine deliveries occur for engines with costs below the projected contract per unit average cost over the life of the contract. As of December 31, 2017 and 2016, inventory included $438 million and $233 million, respectively, of such capitalized amounts. See Note 1 for further discussion regarding the impact from the adoption of the New Revenue Standard effective January 1, 2018.

Our sales contracts in many cases are long-term contracts expected to be performed over periods exceeding 12 months. At December 31, 2017 and 2016, approximately 63% and 68% respectively, of total inventories and contracts in progress have been acquired or manufactured under such long-term contracts, with approximately 38% and 41% scheduled for delivery within the succeeding 12 months for 2017 and 2016, respectively.

Fixed Assets

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Fixed Assets

FIXED ASSETS



(dollars in millions)	Estimated Useful Lives	2017			2016
Land		$	412		$	392
Buildings and improvements	12-40 years	5,727			5,180
Machinery, tools and equipment	3-20 years	13,476			12,471
Other, including assets under construction		1,749			1,426
		21,364			19,469
Accumulated depreciation		(11,178		)	(10,311		)
		$	10,186		$	9,158

Depreciation expense was $1,178 million in 2017, $1,105 million in 2016 and $1,068 million in 2015.

Accrued Liabilities

12 Months Ended

Dec. 31, 2017

Accrued Liabilities [Abstract]

Accrued Liabilities

ACCRUED LIABILITIES



(dollars in millions)	2017		2016
Advances on sales contracts and service billings	$	4,547	$	4,217
Accrued salaries, wages and employee benefits	1,741		1,608
Service and warranty accruals	629		555
Interest payable	439		395
Litigation and contract matters	435		488
Income taxes payable	285		382
Accrued property, sales and use taxes	258		289
Canadian government settlement - current portion	217		245
Accrued restructuring costs	212		210
Accrued workers compensation	204		208
Other	3,349		3,622
	$	12,316	$	12,219

On December 30, 2015, P&WC and federal and provincial Canadian government agencies entered into amendments of certain government research and development support arrangements. Under the amendments, P&WC agreed to make four annual payments of approximately $327 million Canadian (approximately $256 million at December 2017), commencing in the first quarter of 2016, to fully settle and terminate P&WC's future contractual obligations to pay royalties to these agencies that had previously been contingent upon future engine deliveries and P&WC sales; to maintain its commitments to perform certain assembly, test and manufacturing operations in Canada; and to provide support of innovation and research and development through initiatives with post-secondary institutions and key industry associations in Canada over a 14 year period. As a result of the amendments to these contractual arrangements, Pratt & Whitney recorded a charge and related discounted obligation of $867 million in the fourth quarter of 2015.

The Canadian government settlement included in the table above represents amounts expected to be paid under this agreement in 2018, with the remaining accrual of approximately $256 million and $477 million included in Other long-term liabilities in the accompanying Consolidated Balance Sheet as of December 31, 2017 and 2016, respectively.

Borrowings and Lines of Credit

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Borrowings and Lines of Credit

BORROWINGS AND LINES OF CREDIT



(dollars in millions)	2017		2016
Short-term borrowings:
Commercial paper	$	300	$	522
Other borrowings	92		79
Total short-term borrowings	$	392	$	601

At December 31, 2017, we had revolving credit agreements with various banks permitting aggregate borrowings of up to $4.35 billion pursuant to a $2.20 billion revolving credit agreement and a $2.15 billion multicurrency revolving credit agreement, both of which expire in August 2021. As of December 31, 2017, there were no borrowings under either of these agreements. The undrawn portions of these revolving credit agreements are also available to serve as backup facilities for the issuance of commercial paper. As of December 31, 2017, our maximum commercial paper borrowing limit was $4.35 billion. We had no Euro-denominated commercial paper borrowings outstanding at December 31, 2017. We use our commercial paper borrowings for general corporate purposes, including the funding of potential acquisitions, discretionary pension contributions, debt refinancing, dividend payments and repurchases of our common stock. The need for commercial paper borrowings arises when the use of domestic cash for general corporate purposes exceeds the sum of domestic cash generation and foreign cash repatriated to the U.S.

At December 31, 2017, approximately $1.3 billion was available under short-term lines of credit with local banks at our various domestic and international subsidiaries. The weighted-average interest rates applicable to short-term borrowings and total debt were as follows:



	2017		2016
Average interest expense rate - average outstanding borrowings during the year:
Short-term borrowings	1.1	%	1.3	%
Total debt	3.5	%	4.1	%

Average interest expense rate - outstanding borrowings as of December 31:
Short-term borrowings	2.3	%	0.6	%
Total debt	3.5	%	3.7	%

Long-term debt consisted of the following as of December 31:



(dollars in millions)	2017			2016
1.800% notes due 2017 ¹	—			1,500
6.800% notes due 2018	99			99
EURIBOR plus 0.80% floating rate notes due 2018 (€750 million principal value) ²	890			783
1.778% junior subordinated notes due 2018	1,100			1,100
LIBOR plus 0.350% floating rate notes due 2019 ³	350			350
1.500% notes due 2019 ¹	650			650
EURIBOR plus 0.15% floating rate notes due 2019 (€750 million principal value) ²	890			—
8.875% notes due 2019	271			271
4.875% notes due 2020 ¹	171			171
4.500% notes due 2020 ¹	1,250			1,250
1.900% notes due 2020 ¹	1,000			—
8.750% notes due 2021	250			250
1.950% notes due 2021 ¹	750			750
1.125% notes due 2021 (€950 million principal value) ¹	1,127			992
2.300% notes due 2022 ¹	500			—
3.100% notes due 2022 ¹	2,300			2,300
1.250% notes due 2023 (€750 million principal value) ¹	890			783
2.800% notes due 2024 ¹	800			—
1.875% notes due 2026 (€500 million principal value) ¹	593			522
2.650% notes due 2026 ¹	1,150			1,150
3.125% notes due 2027 ¹	1,100			—
7.100% notes due 2027	141			141
6.700% notes due 2028	400			400
7.500% notes due 2029 ¹	550			550
5.400% notes due 2035 ¹	600			600
6.050% notes due 2036 ¹	600			600
6.800% notes due 2036 ¹	134			134
7.000% notes due 2038	159			159
6.125% notes due 2038 ¹	1,000			1,000
5.700% notes due 2040 ¹	1,000			1,000
4.500% notes due 2042 ¹	3,500			3,500
4.150% notes due 2045 ¹	850			850
3.750% notes due 2046 ¹	1,100			1,100
4.050% notes due 2047 ¹	600			—
Project financing obligations	158			155
Other (including capitalized leases)	195			189
Total principal long-term debt	27,118			23,299
Other (fair market value adjustments, discounts and debt issuance costs)	(25		)	1
Total long-term debt	27,093			23,300
Less: current portion	2,104			1,603
Long-term debt, net of current portion	$	24,989		$	21,697


1	We may redeem these notes at our option pursuant to their terms.


2	The three-month EURIBOR rate as of December 29, 2017 was approximately -0.329%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.


3	The three-month LIBOR rate as of December 29, 2017 was approximately 1.694%.

In connection with the merger agreement with Rockwell Collins announced on September 4, 2017, we have entered into a $6.5 billion 364-day unsecured bridge loan credit agreement that would be funded only to the extent certain anticipated debt issuances are not completed prior to the completion of the merger. See Note 2 for additional discussion.

On November 13, 2017, we issued €750 million aggregate principal amount of floating rate notes due 2019. The interest rate is reset quarterly based upon the three-month EURIBOR rate plus 0.15%, with a minimum interest rate for any period of no less than 0.00%. The net proceeds from this debt issuance were used to fund the repayment of commercial paper and for other general corporate purposes.

On May 4, 2017, we issued $1.0 billion aggregate principal amount of 1.900% notes due 2020, $500 million aggregate principal amount of 2.300% notes due 2022, $800 million aggregate principal amount of 2.800% notes due 2024, $1.1 billion aggregate principal amount of 3.125% notes due 2027 and $600 million aggregate principal amount of 4.050% notes due 2047. The net proceeds received from these debt issuances were used to fund the repayment at maturity of our 1.800% notes due 2017, representing $1.5 billion in aggregate principal, and for other general corporate purposes.

On December 1, 2016, we redeemed all outstanding 5.375% notes due in 2017, representing $1.0 billion in aggregate principal, and all outstanding 6.125% notes due in 2019, representing $1.25 billion in aggregate principal, under our redemption notice issued on November 1, 2016. A combined net extinguishment loss of approximately $164 million was recognized within Interest expense, net in the accompanying Consolidated Statement of Operations.

On November 1, 2016, we issued $650 million aggregate principal amount of 1.500% notes due 2019, $750 million aggregate principal amount of 1.950% notes due 2021, $1,150 million aggregate principal amount of 2.650% notes due 2026, $1,100 million aggregate principal amount of 3.750% notes due 2046 and $350 million aggregate principal amount of floating rate notes due 2019. We used the net proceeds received from these issuances to fund the redemption price of the 5.375% notes due 2017 and the 6.125% notes due 2019, to fund the repayment of commercial paper, and for other general corporate purposes.

On February 22, 2016, we issued €950 million aggregate principal amount of 1.125% notes due 2021, €500 million aggregate principal amount of 1.875% notes due 2026 and €750 million aggregate principal amount of floating rate notes due 2018. The net proceeds from these debt issuances were used for general corporate purposes.

The project financing obligations included in the table above are associated with the sale of rights to unbilled revenues related to the ongoing activity of an entity owned by UTC Climate, Controls & Security. The percentage of total short-term borrowings and long-term debt at variable interest rates was 9% and 7% at December 31, 2017 and 2016, respectively. Interest rates on our commercial paper borrowings are considered variable due to their short-term duration and high-frequency of turnover.

The average maturity of our long-term debt at December 31, 2017 is approximately 11 years. The schedule of principal payments required on long-term debt for the next five years and thereafter is:



(dollars in millions)
2018	$	2,104
2019	2,271
2020	2,479
2021	2,175
2022	2,804
Thereafter	15,285
Total	$	27,118

We have an existing universal shelf registration statement filed with the Securities and Exchange Commission (SEC) for an indeterminate amount of equity and debt securities for future issuance, subject to our internal limitations on the amount of equity and debt to be issued under this shelf registration statement.

Equity

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

EQUITY

On November 11, 2015, we entered into ASR agreements to repurchase an aggregate of $6.0 billion of our common stock utilizing the net after-tax proceeds from the sale of Sikorsky. Under the terms of the ASR agreements, we made the aggregate payments and received an initial delivery of approximately 51.9 million shares of our common stock, representing approximately 85% of the shares expected to be repurchased. In 2016, the shares associated with the remaining portion of the aggregate purchase were settled upon final delivery to us of approximately 10.1 million additional shares of common stock. Including the remaining shares settled in 2016, the final price under the November 11, 2015 ASR was $96.74 per share.

On March 13, 2015, we entered into ASR agreements to repurchase an aggregate of $2.65 billion of our common stock. Under the terms of the ASR agreements, we made the aggregate payments and received an initial delivery of approximately 18.6 million shares of our common stock, representing approximately 85% of the shares expected to be repurchased. On July 31, 2015, the shares associated with the remaining portion of the aggregate purchase were settled upon final delivery of approximately 4.2 million additional shares of common stock. Including the remaining shares settled on July 31, 2015, the final price under the ASR was $116.11 per share.

On August 3, 2015, we received approximately $1.1 billion from the proceeds of the remarketing of our 1.550% junior subordinated notes, which were originally issued as part of our equity units on June 18, 2012, and issued approximately 11.3 million shares of common stock to settle the purchase obligation of the holders of the equity units under the purchase contract entered into at the time of the original issuance of the equity units.

A summary of the changes in each component of accumulated other comprehensive (loss) income, net of tax for the years ended December 31, 2017 and 2016 is provided below:



(dollars in millions)	Foreign Currency Translation			Defined Benefit Pension and Postretirement Plans			Unrealized Gains (Losses) on Available-for- Sale Securities			Unrealized Hedging (Losses) Gains			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2015	$	(2,438	)	$	(5,135	)	$	293		$	(339	)	$	(7,619	)
Other comprehensive (loss) income before reclassifications, net	(1,042		)	(247		)	119			54			(1,116		)
Amounts reclassified, pre-tax	—			535			(94		)	171			612
Tax (benefit) expense reclassified	—			(198		)	35			(48		)	(211		)
Balance at December 31, 2016	$	(3,480	)	$	(5,045	)	$	353		$	(162	)	$	(8,334	)
Other comprehensive income before reclassifications, net	540			78			3			264			885
Amounts reclassified, pre-tax	(10		)	529			(566		)	(39		)	(86		)
Tax (benefit) expense reclassified	—			(214		)	215			9			10
Balance at December 31, 2017	$	(2,950	)	$	(4,652	)	$	5		$	72		$	(7,525	)

Amounts reclassified related to our defined benefit pension and postretirement plans include amortization of prior service costs and actuarial net losses recognized during each period presented. These costs are recorded as components of net periodic pension cost for each period presented (see Note 12 for additional details).

Amounts reclassified that relate to unrealized gains (losses) on available-for-sale securities, pre-tax includes approximately $500 million of previously unrealized gains reclassified to other income as a result of sales of significant investments in available-for-sale securities in 2017, including UTC Climate, Controls & Security's sale of investments in Watsco, Inc.

All noncontrolling interests with redemption features, such as put options, that are not solely within our control (redeemable noncontrolling interests) are reported in the mezzanine section of the Consolidated Balance Sheet, between liabilities and equity, at the greater of redemption value or initial carrying value. The decrease in the value of redeemable noncontrolling interest in our Consolidated Balance Sheet as of December 31, 2017 is primarily attributable to the acquisition by UTC Climate, Controls & Security of the remaining interest in an Italian heating products and services company, initially acquired in 2016.

Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Contingency [Line Items]

Income Taxes

INCOME TAXES

Income Before Income Taxes. The sources of income from continuing operations before income taxes are:



(dollars in millions)	2017		2016		2015
United States	$	2,990	$	2,534	$	2,782
Foreign	4,773		4,599		3,685
	$	7,763	$	7,133	$	6,467

On December 22, 2017 Public Law 115-97 “An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018” was enacted. This law is commonly referred to as the Tax Cuts and Jobs Act of 2017 (TCJA).

The Company recorded a tax charge of $690 million in connection with the passage of the TCJA. This amount relates to U.S. income tax attributable to previously undistributed earnings of UTC's international subsidiaries and equity investments, net of foreign tax credits, and the revaluation of U.S. deferred income taxes. In accordance with Staff Accounting Bulletin 118 (SAB 118) issued on December 22, 2017, the U.S. income tax attributable to the TCJA’s deemed repatriation provision, the revaluation of U.S. deferred taxes and the tax consequences relating to states with current conformity to the Internal Revenue Code are provisional amounts. Due to the enactment date and tax complexities of the TCJA, the Company has not completed its accounting related to these items.

The Company operates in approximately 80 countries through numerous subsidiaries and joint venture arrangements. To complete the accounting associated with the TCJA, the Company will continue to review the technical interpretations of the underlying law, monitor state legislative changes, and review U.S. federal and state guidance as it is issued. For example, on January 19, 2018, the Department of the Treasury issued Notice 2018-13. We anticipate an additional tax cost of approximately $70 million related to this notice. This amount will be recorded in the first quarter 2018 together with other adjustments as appropriate. Further, the Company will continue to accumulate and refine the relevant data and computational elements needed to finalize its accounting for the effects of the TCJA by December 22, 2018.

Prior to enactment of the TCJA, with few exceptions, U.S. income taxes had not been provided on undistributed earnings of UTC's international subsidiaries as the Company had intended to reinvest such earnings permanently outside the U.S. or to repatriate such earnings only when it was tax effective to do so. As of December 31, 2017 such undistributed earnings were approximately $34 billion. The Company is evaluating the impact of the TCJA on its existing accounting position related to the undistributed earnings. Due to the inherent complexities in determining any incremental U.S. Federal and State taxes and the non-U.S. taxes that may be due if the earnings were remitted to the U.S. and in accordance with SAB 118 this evaluation has not been completed and no provisional amount has been recorded in regard to this amount.

Provision for Income Taxes. The income tax expense (benefit) for the years ended December 31, 2017, 2016 and 2015 consisted of the following components:



(dollars in millions)	2017			2016			2015
Current:
United States:
Federal	$	1,577		$	30		$	328
State	64			(21		)	(37		)
Foreign	1,140			1,290			1,158
	2,781			1,299			1,449
Future:
United States:
Federal	(27		)	318			712
State	84			134			109
Foreign	5			(54		)	(159		)
	62			398			662
Income tax expense	$	2,843		$	1,697		$	2,111
Attributable to items credited (charged) to equity	$	(128	)	$	(299	)	$	(114	)

Reconciliation of Effective Income Tax Rate. Differences between effective income tax rates and the statutory U.S. federal income tax rate are as follows:



	2017		2016		2015
Statutory U.S. federal income tax rate	35.0	%	35.0	%	35.0	%
Tax on international activities	(6.4	)%	(8.1	)%	(2.0	)%
Tax audit settlements	(0.7	)%	(2.9	)%	—
U.S. tax reform	8.9	%	—		—
Other	(0.2	)%	(0.2	)%	(0.4	)%
Effective income tax rate	36.6	%	23.8	%	32.6	%

The 2017 effective tax rate reflects a net tax charge of $690 million, as described above, attributable to the passage of the TCJA.

The decrease in the Tax audit settlement represents a $55 million favorable adjustment in 2017 related to the expiration of certain statute of limitations offset by the absence of the favorable audit settlements in 2016 described below.

The decrease in the benefit associated with international activities is related to international earnings taxed at lower statutory rates offset by the absence of certain credits included in 2016. On December 7, 2017, the province of Quebec enacted a retroactive tax law change resulting in a cost of $48 million offset by the 2016 French law changes described below.

The 2016 effective tax rate reflects $206 million of favorable adjustments related to the conclusion of the review by the Examination Division of the Internal Revenue Service of the UTC 2011 and 2012 tax years and the Goodrich Corporation 2011 and 2012 tax years through the date of its acquisition, as well as the absence of 2015 items described below. In addition, at the end of 2016, France enacted a tax law change reducing its corporate income tax rate, which resulted in a tax benefit of $25 million.

The 2015 effective tax rate reflects an unfavorable tax adjustment of $274 million related to the repatriation of certain foreign earnings, the majority of which were 2015 current year earnings, and a favorable adjustment of approximately $45 million related to a non-taxable gain recorded in the first quarter. France, the U.K. and certain U.S. states enacted tax law changes in the fourth quarter which resulted in a net incremental cost of approximately $68 million in 2015.

Deferred Tax Assets and Liabilities. Future income taxes represent the tax effects of transactions which are reported in different periods for tax and financial reporting purposes. These amounts consist of the tax effects of temporary differences between the tax and financial reporting balance sheets and tax carryforwards. Future income tax benefits and payables within the same tax paying component of a particular jurisdiction are offset for presentation in the Consolidated Balance Sheet. The amounts related to 2017 have been provisionally adjusted for the impact of the TCJA.

The tax effects of temporary differences and tax carryforwards which gave rise to future income tax benefits and payables at December 31, 2017 and 2016 are as follows:



(dollars in millions)	2017			2016
Future income tax benefits:
Insurance and employee benefits	$	928		$	2,382
Other asset basis differences	798			1,098
Other liability basis differences	1,158			1,403
Tax loss carryforwards	544			494
Tax credit carryforwards	948			873
Valuation allowances	(582		)	(545		)
	$	3,794		$	5,705
Future income taxes payable:
Other asset basis differences	$	3,415		$	5,376
Other items, net	411			364
	$	3,826		$	5,740

Valuation allowances have been established primarily for tax credit carryforwards, tax loss carryforwards, and certain foreign temporary differences to reduce the future income tax benefits to expected realizable amounts.

Tax Credit and Loss Carryforwards. At December 31, 2017, tax credit carryforwards, principally state and foreign, and tax loss carryforwards, principally state and foreign, were as follows:



(dollars in millions)	Tax Credit Carryforwards		Tax Loss Carryforwards
Expiration period:
2018-2022	$	22	$	307
2023-2027	33		218
2028-2037	269		359
Indefinite	624		1,942
Total	$	948	$	2,826

Unrecognized Tax Benefits. At December 31, 2017, we had gross tax-effected unrecognized tax benefits of $1,189 million, all of which, if recognized, would impact the effective tax rate. A reconciliation of the beginning and ending amounts of unrecognized tax benefits and interest expense related to unrecognized tax benefits for the years ended December 31, 2017, 2016 and 2015 is as follows:



(dollars in millions)	2017			2016			2015
Balance at January 1	$	1,086		$	1,169		$	1,089
Additions for tax positions related to the current year	192			69			206
Additions for tax positions of prior years	73			167			99
Reductions for tax positions of prior years	(91		)	(61		)	(101		)
Settlements	(71		)	(258		)	(124		)
Balance at December 31	$	1,189		$	1,086		$	1,169
Gross interest expense related to unrecognized tax benefits	$	34		$	41		$	39
Total accrued interest balance at December 31	$	215		$	185		$	176

In accordance with SAB 118 described above, the portion of the balance of unrecognized tax benefits at December 31, 2017 related to the TCJA has been determined provisionally based on an analysis of currently available information.

We conduct business globally and, as a result, UTC or one or more of our subsidiaries files income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. In the normal course of business we are subject to examination by taxing authorities throughout the world, including such major jurisdictions as Australia, Belgium, Brazil, Canada, China, France, Germany, Hong Kong, India, Italy, Japan, Mexico, Netherlands, Poland, Singapore, South Korea, Spain, Switzerland, the United Kingdom and the United States. With few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations for years before 2006.

During the quarter ended September 30, 2017, the Company recognized a noncash gain of approximately $64 million, including a pre-tax interest adjustment of $9 million, as a result of federal, state and non-U.S. tax year closures related to audit resolutions and the expiration of applicable statutes of limitation, including expiration of the U.S. federal income tax statute of limitations for UTC’s 2013 tax year.

During the quarter ended December 31, 2016, the Company recognized a noncash gain of approximately $172 million, including a pre-tax interest adjustment of $22 million, as a result of the closure of the audit by the Examination Division of the Internal Revenue Service (IRS) of UTC tax years 2011 and 2012.

During the quarter ended September 30, 2016, the Company recognized a noncash gain of approximately $58 million, primarily tax, as a result of the closure of the audit by the Examination Division of the IRS of Goodrich Corporation tax years 2011 and 2012 through the date of acquisition by UTC.

It is reasonably possible that a net reduction within the range of $40 million to $435 million of unrecognized tax benefits may occur over the next 12 months as a result of additional worldwide uncertain tax positions, the revaluation of current uncertain tax positions arising from developments in examinations, in appeals, or in the courts, or the closure of tax statutes. The range of potential change does not include provisional amounts related to TCJA as sufficient information is not available to complete our analysis at this time.

As of December 31, 2017, UTC’s tax years 2014 and 2015 were under audit by the Examination Division of the Internal Revenue Service. On January 9, 2018 UTC’s 2016 tax year was added to the 2014 - 2015 audit. The combined audit of tax years 2014, 2015 and 2016 is expected to continue beyond the next twelve months.

See Note 18 "Contingent Liabilities" for discussion regarding uncertain tax positions, included in the above range, related to pending litigation with respect to certain deductions claimed in Germany.

Employee Benefit Plans

12 Months Ended

Dec. 31, 2017

Employee Benefits and Share-based Compensation, Noncash [Abstract]

Employee Benefit Plans

EMPLOYEE BENEFIT PLANS

We sponsor numerous domestic and foreign employee benefit plans, which are discussed below.

Employee Savings Plans. We sponsor various employee savings plans. Our contributions to employer sponsored defined contribution plans were $351 million, $318 million and $356 million for 2017, 2016 and 2015, respectively.

Our non-union domestic employee savings plan uses an Employee Stock Ownership Plan (ESOP) for employer matching contributions. External borrowings were used by the ESOP to fund a portion of its purchase of ESOP stock from us. The external borrowings have been extinguished and only re-amortized loans remain between UTC and the ESOP Trust. As ESOP debt service payments are made, common stock is released from an unreleased shares account. ESOP debt may be prepaid or re-amortized to either increase or decrease the number of shares released so that the value of released shares equals the value of plan benefit. We may also, at our option, contribute additional common stock or cash to the ESOP.

Shares of common stock are allocated to employees' ESOP accounts at fair value on the date earned. Cash dividends on common stock held by the ESOP are used for debt service payments. Participants may choose to have their ESOP dividends reinvested or distributed in cash. Common stock allocated to ESOP participants is included in the average number of common shares outstanding for both basic and diluted earnings per share. At December 31, 2017, 26.0 million common shares had been allocated to employees, leaving 10.5 million unallocated common shares in the ESOP Trust, with an approximate fair value of $1.3 billion.

Pension Plans. We sponsor both funded and unfunded domestic and foreign defined benefit pension plans that cover a large number of our employees. Our largest plans are generally closed to new participants. Our plans use a December 31 measurement date consistent with our fiscal year.



(dollars in millions)	2017			2016
Change in Benefit Obligation:
Beginning balance	$	34,923		$	35,428
Service cost	374			383
Interest cost	1,120			1,183
Actuarial loss	1,804			1,831
Total benefits paid	(1,782		)	(1,660		)
Net settlement, curtailment and special termination benefits	(49		)	(1,566		)
Other	609			(676		)
Ending balance	$	36,999		$	34,923

Change in Plan Assets:
Beginning balance	$	30,555		$	31,011
Actual return on plan assets	4,258			3,202
Employer contributions	2,188			384
Benefits paid	(1,782		)	(1,660		)
Settlements	(41		)	(1,632		)
Other	511			(750		)
Ending balance	$	35,689		$	30,555

Funded Status:
Fair value of plan assets	$	35,689		$	30,555
Benefit obligations	(36,999		)	(34,923		)
Funded status of plan	$	(1,310	)	$	(4,368	)

Amounts Recognized in the Consolidated Balance Sheet Consist of:
Noncurrent assets	$	957		$	451
Current liability	(70		)	(72		)
Noncurrent liability	(2,197		)	(4,747		)
Net amount recognized	$	(1,310	)	$	(4,368	)

Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:
Net actuarial loss	$	7,238		$	7,941
Prior service cost (credit)	37			(6		)
Net amount recognized	$	7,275		$	7,935

At the end of fiscal 2015, we changed the approach we had used to estimate the service and interest components of net periodic pension cost for our significant pension plans. This change, compared to the previous approach, resulted in a net decrease in the service and interest components of our annual net periodic pension cost of approximately $215 million for 2016. Historically, we estimated the service and interest cost components utilizing a single-weighted average discount rate derived from the yield curve used to measure the benefit obligation at the beginning of the period. We have elected to utilize a full yield curve approach in the estimation of these components by applying the specific spot rates along the yield curve used in determination of the benefit obligation to the relevant projected cash flows. We made this change to provide a more precise measurement of service and interest costs by improving the correlation between projected benefit cash flows to the corresponding spot yield curve rates. This change does not materially affect the measurement of our total benefit obligations.

As part of our long-term strategy to de-risk our defined benefit pension plans, we made discretionary contributions of approximately $1.9 billion to our domestic defined benefit pension plans in the quarter ended September 30, 2017. In 2016, we entered into an agreement to purchase a group annuity contract to transfer approximately $768 million of our outstanding pension benefit obligations related to certain U.S. retirees or beneficiaries, which was finalized on October 12, 2016. We also offered certain former U.S. employees or beneficiaries (generally all former U.S. participants not yet in receipt of their vested pension benefits) an option to take a one-time lump-sum distribution in lieu of future monthly pension payments, which reduced our pension benefit obligations by approximately $935 million. These transactions reduced the assets of our defined benefit pension plans by approximately $1.5 billion. As a result of these 2016 transactions, we recognized a one-time pre-tax pension settlement charge of approximately $423 million in the fourth quarter of 2016.

The amounts included in "Other" in the above table primarily reflect the impact of foreign exchange translation, primarily for plans in the U.K. and Canada.

As approved in 2016, effective January 1, 2017, a voluntary lump-sum option is available for the frozen final average earnings benefits of certain U.S. salaried employees upon termination of employment after 2016. This option provides participants with the choice of electing to receive a lump-sum payment in lieu of receiving a future monthly pension benefit. This plan change reduced the projected benefit obligation by $170 million.

Qualified domestic pension plan benefits comprise approximately 74% of the projected benefit obligation. Benefits for union employees are generally based on a stated amount for each year of service. For non-union employees, benefits for service up to December 31, 2014 are generally based on an employee's years of service and compensation through December 31, 2014. Benefits for service after December 31, 2014 are based on the existing cash balance formula that was adopted in 2003 for newly hired non-union employees and for other non-union employees who made a one-time voluntary election to have future benefit accruals determined under this formula. Certain foreign plans, which comprise approximately 25% of the projected benefit obligation, are considered defined benefit plans for accounting purposes. Nonqualified domestic pension plans provide supplementary retirement benefits to certain employees and are not a material component of the projected benefit obligation.

We made $1.9 billion of cash contributions to our domestic defined benefit pension plans and made $212 million of cash contributions to our foreign defined benefit pension plans in 2017. In 2016, we made $100 million of cash contributions to our domestic defined benefit pension plans and made $203 million of cash contributions to our foreign defined benefit pension plans.

Information for pension plans with accumulated benefit obligations in excess of plan assets:



(dollars in millions)	2017		2016
Projected benefit obligation	$	22,360	$	32,732
Accumulated benefit obligation	22,159		32,095
Fair value of plan assets	20,438		27,943

The accumulated benefit obligation for all defined benefit pension plans was $36.2 billion and $34.2 billion at December 31, 2017 and 2016, respectively.

The components of the net periodic pension (benefit) cost are as follows:



(dollars in millions)	2017			2016			2015
Pension Benefits:
Service cost	$	374		$	383		$	493
Interest cost	1,120			1,183			1,399
Expected return on plan assets	(2,215		)	(2,202		)	(2,264		)
Amortization of prior service credit	(36		)	(33		)	(11		)
Recognized actuarial net loss	575			572			882
Net settlement, curtailment and special termination benefits loss	3			498			150
Net periodic pension (benefit) cost - employer	$	(179	)	$	401		$	649

Net settlement and curtailment losses for pension benefits includes curtailment losses of approximately $109 million related to, and recorded in, discontinued operations for the year ended December 31, 2015. In addition, total net periodic pension cost includes approximately $98 million related to, and recorded in, discontinued operations for the year ended December 31, 2015.

Other changes in plan assets and benefit obligations recognized in other comprehensive loss in 2017 are as follows:



(dollars in millions)
Current year actuarial gain	$	(239	)
Amortization of actuarial loss	(575		)
Current year prior service cost	4
Amortization of prior service credit	36
Net settlement and curtailment loss	(11		)
Other	125
Total recognized in other comprehensive loss	$	(660	)
Net recognized in net periodic pension (benefit) cost and other comprehensive loss	$	(839	)

The amount included in "Other" in the above table primarily reflects the impact of foreign exchange translation, primarily for plans in the U.K. and Canada.

The estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension (benefit) cost in 2018 is as follows:



(dollars in millions)
Net actuarial loss	$	402
Prior service credit	(41		)
	$	361

Major assumptions used in determining the benefit obligation and net cost for pension plans are presented in the following table as weighted-averages:



	Benefit Obligation				Net Cost
	2017		2016		2017		2016		2015
Discount rate
PBO	3.4	%	3.8	%	3.8	%	4.1	%	3.8	%
Interest cost¹	—		—		3.3	%	3.4	%	—
Service cost¹	—		—		3.6	%	3.8	%	—
Salary scale	4.2	%	4.1	%	4.1	%	4.2	%	4.2	%
Expected return on plan assets	—		—		7.3	%	7.3	%	7.6	%


Note 1	The 2017 and 2016 discount rates used to measure the service cost and interest cost applies to our significant plans. The PBO discount rate is used for the service cost and interest cost measurements for non-significant plans.

In determining the expected return on plan assets, we consider the relative weighting of plan assets, the historical performance of total plan assets and individual asset classes, and economic and other indicators of future performance. In addition, we may consult with and consider the opinions of financial and other professionals in developing appropriate capital market assumptions. Return projections are also validated using a simulation model that incorporates yield curves, credit spreads and risk premiums to project long-term prospective returns.

The plans' investment management objectives include providing the liquidity and asset levels needed to meet current and future benefit payments, while maintaining a prudent degree of portfolio diversification considering interest rate risk and market volatility. Globally, investment strategies target a mix of 50% to 55% of growth seeking assets and 45% to 50% of income generating and hedging assets using a wide diversification of asset types, fund strategies and investment managers. The growth seeking allocation consists of global public equities in developed and emerging countries, private equity, real estate and multi-asset class strategies. Growth assets include an enhanced alpha strategy that invests in publicly traded equity and fixed income securities, derivatives and foreign currency. Investments in private equity are primarily via limited partnership interests in buy-out strategies with smaller allocations to distressed debt funds. The real estate strategy is principally concentrated in directly held U.S. core investments with some smaller investments in international, value-added and opportunistic strategies. Within the income generating assets, the fixed income portfolio consists of mainly government and broadly diversified high quality corporate bonds.

The plans have continued their pension risk management techniques designed to reduce the plans' interest rate risk. More specifically, the plans have incorporated liability hedging programs that include the adoption of a risk reduction objective as part of the long-term investment strategy. Under this objective the interest rate hedge is dynamically increased as funded status improves. The hedging programs incorporate a range of assets and investment tools, each with ranging interest rate sensitivity. As result of the improved funded status of the plans due to favorable asset returns and funding of the plans, the interest rate hedge increased significantly during 2017. The investment portfolios are currently hedging approximately 55% to 60% of the interest rate sensitivity of the pension plan liabilities.

As a result of the shift in the target asset mix to higher income generating and hedging assets and lower growth seeking assets, we will reduce the expected return on plan assets assumption for 2018 including the assumption of a 7% return on plan assets for our qualified domestic pension plans.

The fair values of pension plan assets at December 31, 2017 and 2016 by asset category are as follows:



(dollars in millions)	Quoted Prices in Active Markets For Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Not Subject to Leveling		Total
Asset Category:
Public Equities
Global Equities	$	3,129	$	3	$	—	$	—	$	3,132
Global Equity Commingled Funds¹	—		1,084		—		—		1,084
Enhanced Global Equities²	213		819		—		—		1,032
Global Equity Funds at net asset value⁸	—		—		—		7,599		7,599
Private Equities^3,8	—		—		46		1,170		1,216
Fixed Income Securities
Governments	1,445		69		—		—		1,514
Corporate Bonds	—		10,929		—		—		10,929
Fixed Income Securities⁸	—		—		—		3,519		3,519
Real Estate^4,8	—		15		1,446		396		1,857
Other^5,8	—		287		—		2,509		2,796
Cash & Cash Equivalents^6,8	—		79		—		498		577
Subtotal	$	4,787	$	13,285	$	1,492	$	15,691	35,255
Other Assets & Liabilities⁷									434
Total at December 31, 2017									$	35,689
Public Equities
Global Equities	$	4,682	$	3	$	—	$	—	$	4,685
Global Equity Commingled Funds¹	—		367		—		—		367
Enhanced Global Equities²	168		1,494		—		—		1,662
Global Equity Funds at net asset value ⁸	—		—		—		7,090		7,090
Private Equities^3,8	—		—		122		1,239		1,361
Fixed Income Securities
Governments	260		54		—		—		314
Corporate Bonds	—		7,637		—		—		7,637
Fixed Income Securities⁸	—		—		—		2,788		2,788
Real Estate^4,8	—		17		1,285		513		1,815
Other^5,8	—		289		—		1,819		2,108
Cash & Cash Equivalents^6,8	100		75		—		121		296
Subtotal	$	5,210	$	9,936	$	1,407	$	13,570	30,123
Other Assets & Liabilities⁷									432
Total at December 31, 2016									$	30,555


Note 1	Represents commingled funds that invest primarily in common stocks.


Note 2	Represents enhanced equity separate account and commingled fund portfolios. A portion of the portfolio may include long-short market neutral and relative value strategies that invest in publicly traded, equity and fixed income securities, as well as derivatives of equity and fixed income securities and foreign currency.


Note 3	Represents limited partner investments with general partners that primarily invest in debt and equity.


Note 4	Represents investments in real estate including commingled funds and directly held properties.


Note 5	Represents insurance contracts and global balanced risk commingled funds consisting mainly of equity, bonds and some commodities.


Note 6	Represents short-term commercial paper, bonds and other cash or cash-like instruments.


Note 7	Represents trust receivables and payables that are not leveled.

Note 8

In accordance with ASU 2015-07, Fair Value Measurement (Topic 820), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented for the total pension benefits plan assets.

Derivatives in the plan are primarily used to manage risk and gain asset class exposure while still maintaining liquidity. Derivative instruments mainly consist of equity futures, interest rate futures, interest rate swaps and currency forward contracts.

Our common stock represents approximately 1% of total plan assets at both December 31, 2017 and 2016. We review our assets at least quarterly to ensure we are within the targeted asset allocation ranges and, if necessary, asset balances are adjusted back within target allocations. We employ a broadly diversified investment manager structure that includes diversification by active and passive management, style, capitalization, country, sector, industry and number of investment managers.

The fair value measurement of plan assets using significant unobservable inputs (Level 3) changed due to the following:



(dollars in millions)	Private Equities			Real Estate		Total
Balance, December 31, 2015	$	182		$	1,165	$	1,347
Realized gains	46			19		65
Unrealized gains relating to instruments still held in the reporting period	5			18		23
Purchases, sales, and settlements, net	(111		)	83		(28		)
Balance, December 31, 2016	122			1,285		1,407
Realized gains	61			31		92
Unrealized (losses) gains relating to instruments still held in the reporting period	(47		)	17		(30		)
Purchases, sales, and settlements, net	(90		)	113		23
Balance, December 31, 2017	$	46		$	1,446	$	1,492

Quoted market prices are used to value investments when available. Investments in securities traded on exchanges, including listed futures and options, are valued at the last reported sale prices on the last business day of the year or, if not available, the last reported bid prices. Fixed income securities are primarily measured using a market approach pricing methodology, where observable prices are obtained by market transactions involving identical or comparable securities of issuers with similar credit ratings. Mortgages have been valued on the basis of their future principal and interest payments discounted at prevailing interest rates for similar investments. Investment contracts are valued at fair value by discounting the related cash flows based on current yields of similar instruments with comparable durations. Real estate investments are valued on a quarterly basis using discounted cash flow models which consider long-term lease estimates, future rental receipts and estimated residual values. Valuation estimates are supplemented by third-party appraisals on an annual basis.

Private equity limited partnerships are valued quarterly using discounted cash flows, earnings multiples and market multiples. Valuation adjustments reflect changes in operating results, financial condition, or prospects of the applicable portfolio company. Over-the-counter securities and government obligations are valued at the bid prices or the average of the bid and ask prices on the last business day of the year from published sources or, if not available, from other sources considered reliable, generally broker quotes. Temporary cash investments are stated at cost, which approximates fair value.

As a result of the $1.9 billion contribution, we are not required to make additional contributions to our domestic defined benefit pension plans through the end of 2028. We expect to make total contributions of approximately $100 million to our global defined benefit pension plans in 2018. Contributions do not reflect benefits to be paid directly from corporate assets.

Benefit payments, including amounts to be paid from corporate assets, and reflecting expected future service, as appropriate, are expected to be paid as follows: $2,044 million in 2018, $1,903 million in 2019, $1,952 million in 2020, $2,004 million in 2021, $2,054 million in 2022, and $10,710 million from 2023 through 2027.

Postretirement Benefit Plans. We sponsor a number of postretirement benefit plans that provide health and life benefits to eligible retirees. Such benefits are provided primarily from domestic plans, which comprise approximately 85% of the benefit obligation. The postretirement plans are unfunded.



(dollars in millions)	2017			2016
Change in Benefit Obligation:
Beginning balance	$	805		$	890
Service cost	2			3
Interest cost	29			34
Actuarial gain	(4		)	(48		)
Total benefits paid	(87		)	(97		)
Other	22			23
Ending balance	$	767		$	805

Change in Plan Assets:
Beginning balance	$	—		$	—
Employer contributions	71			80
Benefits paid	(87		)	(97		)
Other	16			17
Ending balance	$	—		$	—

Funded Status:
Fair value of plan assets	$	—		$	—
Benefit obligations	(767		)	(805		)
Funded status of plan	$	(767	)	$	(805	)

Amounts Recognized in the Consolidated Balance Sheet Consist of:
Current liability	$	(72	)	$	(78	)
Noncurrent liability	(695		)	(727		)
Net amount recognized	$	(767	)	$	(805	)

Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:
Net actuarial gain	$	(143	)	$	(152	)
Prior service credit	(10		)	(5		)
Net amount recognized	$	(153	)	$	(157	)

The components of net periodic benefit cost are as follows:



(dollars in millions)	2017			2016			2015
Other Postretirement Benefits:
Service cost	$	2		$	3		$	3
Interest cost	29			34			34
Amortization of prior service credit	(1		)	—			—
Recognized actuarial net gain	(9		)	(4		)	(4		)
Net settlement and curtailment gain	—			—			(1		)
Net periodic other postretirement benefit cost	$	21		$	33		$	32

Other changes in plan assets and benefit obligations recognized in other comprehensive loss in 2017 are as follows:



(dollars in millions)
Current year actuarial gain	$	(2	)
Current year prior service credit	(6		)
Amortization of prior service credit	1
Amortization of actuarial net gain	9
Other	2
Total recognized in other comprehensive loss	$	4
Net recognized in net periodic other postretirement benefit cost and other comprehensive loss	$	25

The estimated amounts that will be amortized from accumulated other comprehensive loss into net periodic benefit cost in 2018 include actuarial net gains of $10 million and prior service credits of $3 million.

Major assumptions used in determining the benefit obligation and net cost for postretirement plans are presented in the following table as weighted-averages:



	Benefit Obligation				Net Cost
	2017		2016		2017		2016		2015
Discount rate	3.4	%	3.8	%	3.8	%	4.0	%	3.8	%

Assumed health care cost trend rates are as follows:



	2017		2016
Health care cost trend rate assumed for next year	7.0	%	6.5	%
Rate that the cost trend rate gradually declines to	5.0	%	5.0	%
Year that the rate reaches the rate it is assumed to remain at	2026		2022

Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects:



	2017 One-Percentage-Point
(dollars in millions)	Increase		Decrease
Effect on total service and interest cost	$	2	$	(2	)
Effect on postretirement benefit obligation	40		(35		)

Benefit payments, including net amounts to be paid from corporate assets and reflecting expected future service, as appropriate, are expected to be paid as follows: $72 million in 2018, $67 million in 2019, $64 million in 2020, $59 million in 2021, $54 million in 2022, and $225 million from 2023 through 2027.

Multiemployer Benefit Plans. We contribute to various domestic and foreign multiemployer defined benefit pension plans. The risks of participating in these multiemployer plans are different from single-employer plans in that assets contributed are pooled and may be used to provide benefits to employees of other participating employers. If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. Lastly, if we choose to stop participating in some of our multiemployer plans, we may be required to pay those plans a withdrawal liability based on the underfunded status of the plan.

Our participation in these plans for the annual periods ended December 31 is outlined in the table below. Unless otherwise noted, the most recent Pension Protection Act (PPA) zone status available in 2017 and 2016 is for the plan's year-end at June 30, 2016, and June 30, 2015, respectively. The zone status is based on information that we received from the plan and is certified by the plan's actuary. Our significant plan is in the green zone which represents a plan that is at least 80% funded and does not require a financial improvement plan (FIP) or a rehabilitation plan (RP). An extended amortization provision of ten years is utilized to recognize investment gains or losses for our significant plan.



(dollars in millions)		Pension Protection Act Zone Status		FIP/ RP Status	Contributions
Pension Fund	EIN/Pension Plan Number	2017	2016	Pending/ Implemented	2017		2016		2015		Surcharge Imposed	Expiration Date of Collective-Bargaining Agreement
National Elevator Industry Pension Plan	23-2694291	Green	Green	No	$	114	$	100	$	88	No	July 8, 2022
Other funds					31		31		32
					$	145	$	131	$	120

For the plan years ended June 30, 2016 and 2015, respectively, we were listed in the National Elevator Industry Pension Plan's Forms 5500 as providing more than 5% of the total contributions for the plan. At the date these financial statements were issued, Forms 5500 were not available for the plan year ending June 30, 2017.

In addition, we participate in several multiemployer arrangements that provide postretirement benefits other than pensions, with the National Elevator Industry Health Benefit Plan being the most significant. These arrangements generally provide medical and life benefits for eligible active employees and retirees and their dependents. Contributions to multiemployer plans that provide postretirement benefits other than pensions were $19 million, $17 million and $15 million for 2017, 2016 and 2015, respectively.

Stock-based Compensation. UTC's long-term incentive plan authorizes various types of market and performance based incentive awards that may be granted to officers and employees. Our Long-Term Incentive Plan (LTIP) was last amended on February 5, 2016. Since the LTIP's inception in 2005, a total of 149 million shares have been authorized for issuance pursuant to awards under the LTIP. All equity-based compensation awards are made exclusively through the LTIP. As of December 31, 2017, approximately 29 million shares remain available for awards under the LTIP. The LTIP does not contain an aggregate annual award limit. We expect that the shares awarded on an annual basis will range from 1.0% to 1.5% of shares outstanding. The LTIP will expire after all authorized shares have been awarded or April 30, 2020, whichever is sooner.

Under the LTIP and predecessor long-term incentive plans, the exercise price of awards is set on the grant date and may not be less than the fair market value per share on that date. Generally, stock appreciation rights and stock options have a term of ten years and a minimum three-year vesting period. In the event of retirement, awards held for more than one year may become vested and exercisable subject to certain terms and conditions. LTIP awards with performance-based vesting generally have a minimum three-year vesting period and vest based on performance against pre-established metrics. In the event of retirement, vesting for awards held more than one year does not accelerate but may vest as scheduled based on actual performance relative to target metrics. We have historically repurchased shares of our common stock in an amount at least equal to the number of shares issued under our equity compensation arrangements and will continue to evaluate this policy in conjunction with our overall share repurchase program.

We measure the cost of all share-based payments, including stock options, at fair value on the grant date and recognize this cost in the Consolidated Statement of Operations as follows:



(dollars in millions)	2017		2016		2015
Continuing operations	$	192	$	152	$	158
Discontinued operations	—		1		17
Total compensation cost recognized	$	192	$	153	$	175

The associated future income tax benefit recognized was $38 million, $49 million and $57 million for the years ended December 31, 2017, 2016 and 2015, respectively. The amounts related to 2017 have been provisionally adjusted for the impact of the TCJA. Please refer to Note 11 for additional detail.

For the years ended December 31, 2017, 2016 and 2015, the amount of cash received from the exercise of stock options was $29 million, $17 million and $41 million, respectively, with an associated tax benefit realized of $100 million, $69 million and $89 million, respectively. In addition, for the years ended December 31, 2017, 2016 and 2015, the associated tax benefit realized from the vesting of performance share units and other restricted awards was $12 million, $17 million and $48 million, respectively. In 2016, we adopted the provisions of ASU 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting." As part of that adoption, we elected to apply the prospective transition method and therefore, did not revise prior years' disclosures. As such, for the year ended December 31, 2015, based on existing guidance prior to the issuance of ASU 2016-09, $64 million of certain tax benefits have been reported as operating cash outflows with corresponding cash inflows from financing activities.

At December 31, 2017, there was $175 million of total unrecognized compensation cost related to non-vested equity awards granted under long-term incentive plans. This cost is expected to be recognized ratably over a weighted-average period of 3.3 years.

A summary of the transactions under all long-term incentive plans for the year ended December 31, 2017 follows:



	Stock Options				Stock Appreciation Rights				Performance Share Units				Other Incentive Shares/Units
(shares and units in thousands)	Shares		Average Price*		Shares		Average Price*		Units		Average Price**		Other Incentive Shares/Units
Outstanding at:
December 31, 2016	2,023		$	89.72	36,413		$	87.18	1,967		$	107.05	2,033
Granted	231		110.81		3,464		110.91		614		110.83		1,006
Exercised / earned	(369	)	77.17		(6,770	)	72.86		(2	)	107.78		(441	)
Cancelled	(103	)	102.00		(720	)	95.23		(699	)	112.16		(123	)
Other	(37	)	$	94.30	335		$	92.54	(4	)	$	106.38	(293	)
December 31, 2017	1,745		$	94.35	32,722		$	92.54	1,876		$	106.38	2,182


*	weighted-average exercise price


**	weighted-average grant stock price

The weighted-average grant date fair value of stock options and stock appreciation rights granted during 2017, 2016 and 2015 was $17.22, $14.02 and $18.69, respectively. The weighted-average grant date fair value of performance share units, which vest upon achieving certain performance metrics, granted during 2017, 2016 and 2015 was $111.00, $91.63 and $120.36, respectively. The total fair value of awards vested during the years ended December 31, 2017, 2016 and 2015 was $138 million, $165 million and $247 million, respectively. The total intrinsic value (which is the amount by which the stock price exceeded the exercise price on the date of exercise) of stock options and stock appreciation rights exercised during the years ended December 31, 2017, 2016 and 2015 was $320 million, $214 million and $281 million, respectively. The total intrinsic value (which is the stock price at vesting) of performance share units and other restricted awards vested was $49 million, $61 million and $151 million during the years ended December 31, 2017, 2016 and 2015, respectively.

The following table summarizes information about equity awards outstanding that are vested and expected to vest and equity awards outstanding that are exercisable at December 31, 2017:



	Equity Awards Vested and Expected to Vest						Equity Awards That Are Exercisable
(shares in thousands; aggregate intrinsic value in millions)	Awards	Average Price*		Aggregate Intrinsic Value		Remaining Term**	Awards	Average Price*		Aggregate Intrinsic Value		Remaining Term**
Stock Options/Stock Appreciation Rights	34,183	$	91.85	$	1,221	5.5 years	21,990	$	84.34	$	951	4.2 years
Performance Share Units/Restricted Stock	3,462	—		442		2.1 years


*	weighted-average exercise price per share


**	weighted-average contractual remaining term in years

The fair value of each option award is estimated on the date of grant using a binomial lattice model. The following table indicates the assumptions used in estimating fair value for the years ended December 31, 2017, 2016 and 2015. Lattice-based option models incorporate ranges of assumptions for inputs; those ranges are as follows:



	2017		2016		2015
Expected volatility	19	%	20%		20% - 23%
Weighted-average volatility	19	%	20	%	21	%
Expected term (in years)	6.5		6.5		6.0 - 6.8
Expected dividend yield	2.4	%	2.7	%	2.2	%
Risk-free rate	0.5% - 2.5%		0.2% - 2.6%		0.0% - 2.2%

Expected volatilities are based on the returns of our stock, including implied volatilities from traded options on our stock for the binomial lattice model. We use historical data to estimate equity award exercise and employee termination behavior within the valuation model. Prior to 2016, separate employee groups and equity award characteristics were considered separately for valuation purposes. The expected term represents an estimate of the period of time equity awards are expected to remain outstanding. The risk-free rate is based on the term structure of interest rates at the time of equity award grant.

Restructuring and Other Costs

12 Months Ended

Dec. 31, 2017

Restructuring and Related Activities [Abstract]

Restructuring and Related Activities Disclosure [Text Block]

RESTRUCTURING COSTS

During 2017, we recorded net pre-tax restructuring costs totaling $253 million for new and ongoing restructuring actions. We recorded charges in the segments as follows:



(dollars in millions)
Otis	$	50
UTC Climate, Controls & Security	111
Pratt & Whitney	5
UTC Aerospace Systems	80
Eliminations and other	7
Total	$	253

Restructuring charges incurred in 2017 primarily relate to actions initiated during 2017 and 2016, and were recorded as follows:



(dollars in millions)
Cost of sales	$	119
Selling, general & administrative	134
Total	$	253

2017 Actions. During 2017, we recorded net pre-tax restructuring costs totaling $176 million for restructuring actions initiated in 2017, consisting of $70 million in cost of sales and $106 million in selling, general and administrative expenses. The 2017 actions relate to ongoing cost reduction efforts, including workforce reductions and consolidation of field operations.

We are targeting to complete in 2018 and 2019 the majority of the remaining workforce and all facility related cost reduction actions initiated in 2017. No specific plans for significant other actions have been finalized at this time. The following table summarizes the accrual balances and utilization by cost type for the 2017 restructuring actions:



(dollars in millions)	Severance			Facility Exit, Lease Termination & Other Costs			Total
Net pre-tax restructuring costs	$	160		$	16		$	176
Utilization and foreign exchange	(76		)	(15		)	(91		)
Balance at December 31, 2017	$	84		$	1		$	85

The following table summarizes expected, incurred and remaining costs for the 2017 restructuring actions by segment:



(dollars in millions)	Expected Costs		Cost Incurred During 2017			Remaining Costs at December 31, 2017
Otis	$	79	$	(43	)	$	36
UTC Climate, Controls & Security	87		(76		)	11
Pratt & Whitney	7		(7		)	—
UTC Aerospace Systems	118		(43		)	75
Eliminations and other	7		(7		)	—
Total	$	298	$	(176	)	$	122

2016 Actions. During 2017, we recorded net pre-tax restructuring costs totaling $57 million for restructuring actions initiated in 2016, consisting of $22 million in cost of sales and $35 million in selling, general and administrative expenses. The 2016 actions relate to ongoing cost reduction efforts, including workforce reductions and the consolidation of field operations. The following table summarizes the accrual balances and utilization by cost type for the 2016 restructuring actions:



(dollars in millions)	Severance			Facility Exit, Lease Termination and Other Costs			Total
Restructuring accruals at January 1, 2017	$	63		$	46		$	109
Net pre-tax restructuring costs	34			23			57
Utilization and foreign exchange	(65		)	(17		)	(82		)
Balance at December 31, 2017	$	32		$	52		$	84

The following table summarizes expected, incurred and remaining costs for the 2016 programs by segment:



(dollars in millions)	Expected Costs		Costs Incurred During 2016			Costs Incurred During 2017			Remaining Costs at December 31, 2017
Otis	$	57	$	(48	)	$	(5	)	$	4
UTC Climate, Controls & Security	79		(45		)	(21		)	13
Pratt & Whitney	118		(118		)	—			—
UTC Aerospace Systems	79		(31		)	(31		)	17
Total	$	333	$	(242	)	$	(57	)	$	34

2015 and Prior Actions. During 2017, we recorded net pre-tax restructuring costs totaling $20 million for restructuring actions initiated in 2015 and prior. As of December 31, 2017, we have approximately $43 million of accrual balances remaining related to 2015 and prior actions.

Financial Instruments

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments Disclosure [Text Block]

NOTE 14: FINANCIAL INSTRUMENTS

We enter into derivative instruments for risk management purposes only, including derivatives designated as hedging instruments under the Derivatives and Hedging Topic of the FASB ASC and those utilized as economic hedges. We operate internationally and, in the ordinary course of business, we are exposed to fluctuations in interest rates, foreign exchange rates and commodity prices. These fluctuations can increase the costs of financing, investing and operating the business. We have used derivative instruments, including swaps, forward contracts and options to manage certain foreign currency, interest rate and commodity price exposures.

The four quarter rolling average of the notional amount of foreign exchange contracts hedging foreign currency transactions was $19.1 billion and $18.3 billion at December 31, 2017 and 2016, respectively. Additional information pertaining to foreign exchange and hedging activities is included in Note 1.

The following table summarizes the fair value of derivative instruments as of December 31, 2017 and 2016, which consist solely of foreign exchange contracts:



	Asset Derivatives				Liability Derivatives
(dollars in millions)	2017		2016		2017		2016
Derivatives designated as hedging instruments	$	178	$	15	$	18	$	196
Derivatives not designated as hedging instruments	75		155		60		158

As discussed in Note 9, at December 31, 2017 we have issued approximately €3.7 billion of euro-denominated long-term debt, which qualifies as a net investment hedge against our investments in European businesses. As of December 31, 2017, the net investment hedge is deemed to be effective.

The impact from foreign exchange derivative instruments that qualified as cash flow hedges was as follows:



	Year Ended December 31,
(dollars in millions)	2017			2016
Gain recorded in Accumulated other comprehensive loss	$	347		$	75
(Gain) loss reclassified from Accumulated other comprehensive loss into Product sales (effective portion)	$	(39	)	$	171

Assuming current market conditions continue, a $66 million pre-tax loss is expected to be reclassified from Accumulated other comprehensive loss into Product sales to reflect the fixed prices obtained from foreign exchange hedging within the next 12 months. At December 31, 2017, all derivative contracts accounted for as cash flow hedges mature by December 2021.

The effect on the Consolidated Statement of Operations of foreign exchange contracts not designated as hedging instruments was as follows:



	Year Ended December 31,
(dollars in millions)	2017		2016
Gain recognized in Other income, net	$	77	$	56

During the year ended December 31, 2017, we had net cash payments of approximately $317 million for the settlement of derivative contracts. During the years ended December 31, 2016 and 2015, we had net cash receipts of approximately $249 million and $160 million, respectively, from the settlement of derivative contracts.

Fair Value Measurements

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

FAIR VALUE MEASUREMENTS

In accordance with the provisions of ASC 820, the following tables provide the valuation hierarchy classification of assets and liabilities that are carried at fair value and measured on a recurring and nonrecurring basis in our Consolidated Balance Sheet as of December 31, 2017 and 2016:



2017 (dollars in millions)	Total			Level 1		Level 2			Level 3
Recurring fair value measurements:
Available-for-sale securities	$	64		$	64	$	—		$	—
Derivative assets	253			—		253			—
Derivative liabilities	(78		)	—		(78		)	—



2016 (dollars in millions)	Total			Level 1		Level 2			Level 3
Recurring fair value measurements:
Available-for-sale securities	$	987		$	987	$	—		$	—
Derivative assets	170			—		170			—
Derivative liabilities	(354		)	—		(354		)	—

The reduction in value of available-for-sale securities as of December 31, 2017, as compared to December 31, 2016, is primarily the result of sales of these securities in 2017, including UTC Climate, Controls & Security's sale of investments in Watsco, Inc. during 2017.

Valuation Techniques. Our available-for-sale securities include equity investments that are traded in active markets, either domestically or internationally, and are measured at fair value using closing stock prices from active markets. Our derivative assets and liabilities include foreign exchange contracts and commodity derivatives that are measured at fair value using internal models based on observable market inputs such as forward rates, interest rates, our own credit risk and our counterparties' credit risks. As of December 31, 2017, there were no significant transfers in or out of Level 1 and Level 2.

As of December 31, 2017, there has not been any significant impact to the fair value of our derivative liabilities due to our own credit risk. Similarly, there has not been any significant adverse impact to our derivative assets based on our evaluation of our counterparties' credit risks.

The following table provides carrying amounts and fair values of financial instruments that are not carried at fair value at December 31, 2017 and 2016:



	December 31, 2017						December 31, 2016
(dollars in millions)	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Long-term receivables	$	127		$	121		$	127		$	121
Customer financing notes receivable	609			596			437			420
Short-term borrowings	(392		)	(392		)	(600		)	(600		)
Long-term debt (excluding capitalized leases)	(27,067		)	(29,180		)	(23,280		)	(25,110		)
Long-term liabilities	(362		)	(330		)	(457		)	(427		)

The following table provides the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Consolidated Balance Sheet as of December 31, 2017:



(dollars in millions)	Total			Level 1		Level 2			Level 3
Long-term receivables	$	121		$	—	$	121		$	—
Customer financing notes receivable	596			—		596			—
Short-term borrowings	(392		)	—		(300		)	(92		)
Long-term debt (excluding capitalized leases)	(29,180		)	—		(28,970		)	(210		)
Long-term liabilities	(330		)	—		(330		)	—

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Variable Interest Entities (Notes)

12 Months Ended

Dec. 31, 2017

Schedule of Variable Interest Entities [Abstract]

Variable Interest Entity Disclosure [Text Block]

VARIABLE INTEREST ENTITIES

Pratt & Whitney holds a 61% interest in the IAE International Aero Engines AG (IAE) collaboration with MTU Aero Engines AG (MTU) and Japanese Aero Engines Corporation (JAEC) and a 49.5% ownership interest in IAE. IAE's business purpose is to coordinate the design, development, manufacturing and product support of the V2500 program through involvement with the collaborators. Additionally, Pratt & Whitney, JAEC and MTU are participants in International Aero Engines, LLC (IAE LLC), whose business purpose is to coordinate the design, development, manufacturing and product support for the PW1100G-JM engine for the Airbus A320neo aircraft and the PW1400G-JM engine for the Irkut MC21 aircraft. Pratt & Whitney holds a 59% net interest and a 59% ownership interest in IAE LLC. IAE and IAE LLC retain limited equity with the primary economics of the programs passed to the participants. As such, we have determined that IAE and IAE LLC are variable interest entities with Pratt & Whitney the primary beneficiary. IAE and IAE LLC have, therefore, been consolidated. The carrying amounts and classification of assets and liabilities for variable interest entities in our Consolidated Balance Sheet as of December 31, 2017 and 2016 are as follows:



(dollars in millions)	2017		2016
Current assets	$	3,976	$	2,722
Noncurrent assets	1,534		1,334
Total assets	$	5,510	$	4,056
Current liabilities	$	3,601	$	2,422
Noncurrent liabilities	2,086		1,636
Total liabilities	$	5,687	$	4,058

Guarantees

12 Months Ended

Dec. 31, 2017

Guarantees [Abstract]

Guarantees

GUARANTEES

We extend a variety of financial, market value and product performance guarantees to third parties. As of December 31, 2017 and 2016, the following financial guarantees were outstanding:



	December 31, 2017				December 31, 2016
(dollars in millions)	Maximum Potential Payment		Carrying Amount of Liability		Maximum Potential Payment		Carrying Amount of Liability
Commercial aerospace financing arrangements (see Note 5)	$	336	$	8	$	348	$	14
Credit facilities and debt obligations (expire 2018 to 2028)	256		15		270		15
Performance guarantees	56		2		55		4

We also have obligations arising from sales of certain businesses and assets, including those from representations and warranties and related indemnities for environmental, health and safety, tax and employment matters. The maximum potential payment related to these obligations is not a specified amount as a number of the obligations do not contain financial caps. The carrying amount of liabilities related to these obligations was $179 million and $171 million at December 31, 2017 and December 31, 2016, respectively. For additional information regarding the environmental indemnifications, see Note 18.

We accrue for costs associated with guarantees when it is probable that a liability has been incurred and the amount can be reasonably estimated. The most likely cost to be incurred is accrued based on an evaluation of currently available facts, and where no amount within a range of estimates is more likely, the minimum is accrued. In accordance with the Guarantees Topic of the FASB ASC, we record these liabilities at fair value.

We provide service and warranty policies on our products and extend performance and operating cost guarantees beyond our normal service and warranty policies on some of our products, particularly commercial aircraft engines. In addition, we incur discretionary costs to service our products in connection with specific product performance issues. Liabilities for performance and operating cost guarantees are based upon future product performance and durability, and are largely estimated based upon historical experience. Adjustments are made to accruals as claim data and historical experience warrant. The changes in the carrying amount of service and product warranties and product performance guarantees for the years ended December 31, 2017 and 2016 are as follows:



(dollars in millions)	2017			2016
Balance as of January 1	$	1,199		$	1,212
Warranties and performance guarantees issued	323			246
Settlements made	(207		)	(240		)
Other	9			(19		)
Balance as of December 31	$	1,324		$	1,199

Contingent Liabilities	12 Months Ended
Contingent Liabilities	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingent Liabilities	CONTINGENT LIABILITIES Except as otherwise noted, while we are unable to predict the final outcome, based on information currently available, we do not believe that resolution of any of the following matters will have a material adverse effect upon our competitive position, results of operations, cash flows or financial condition. Leases. We occupy space and use certain equipment under lease arrangements. Rental commitments of approximately $2.3 billion at December 31, 2017 under long-term non-cancelable operating leases are payable as follows: $498 million in 2018, $430 million in 2019, $325 million in 2020, $221 million in 2021, $143 million in 2022 and $635 million thereafter. Rent expense was $411 million in 2017 and $386 million in 2016 and 2015. Additional information pertaining to commercial aerospace rental commitments is included in Note 5 to the Consolidated Financial Statements. Environmental. Our operations are subject to environmental regulation by federal, state and local authorities in the United States and regulatory authorities with jurisdiction over our foreign operations. As described in Note 1 to the Consolidated Financial Statements, we have accrued for the costs of environmental remediation activities, including but not limited to investigatory, remediation, operating and maintenance costs and performance guarantees, and periodically reassess these amounts. We believe that the likelihood of incurring losses materially in excess of amounts accrued is remote. As of December 31, 2017 and 2016, we had $830 million and $829 million reserved for environmental remediation, respectively. Additional information pertaining to environmental matters is included in Note 1 to the Consolidated Financial Statements. Government. In the ordinary course of business, the Company and its subsidiaries and our properties are subject to regulatory and governmental examinations, information gathering requests, inquiries, investigations and threatened legal actions and proceedings. For example, we are now, and believe that, in light of the current U.S. Government contracting environment, we will continue to be the subject of one or more U.S. Government investigations. Such U.S. Government investigations often take years to complete and could result in administrative, civil or criminal liabilities, including repayments, fines, treble and other damages, forfeitures, restitution or penalties, or could lead to suspension or debarment of U.S. Government contracting privileges. For instance, if we or one of our business units were charged with wrongdoing as a result of any of these investigations or other government investigations (including violations of certain environmental or export laws) the U.S. Government could suspend us from bidding on or receiving awards of new U.S. Government contracts pending the completion of legal proceedings. If convicted or found liable, the U.S. Government could fine and debar us from new U.S. Government contracting for a period generally not to exceed three years. The U.S. Government also reserves the right to debar a contractor from receiving new government contracts for fraudulent, criminal or other seriously improper conduct. The U.S. Government could void any contracts found to be tainted by fraud. Our contracts with the U.S. Government are also subject to audits. Like many defense contractors, we have received audit reports, which recommend that certain contract prices should be reduced to comply with various government regulations, including because cost or pricing data we submitted in negotiation of the contract prices or cost accounting practices may not have conformed to government regulations, or that certain payments be delayed or withheld. Some of these audit reports involved substantial amounts. We have made voluntary refunds in those cases we believe appropriate, have settled some allegations and, in some cases, continue to negotiate and/or litigate. In addition, we accrue for liabilities associated with those matters that are probable and can be reasonably estimated. The most likely settlement amount to be incurred is accrued based upon a range of estimates. Where no amount within a range of estimates is more likely, then we accrued the minimum amount. Legal Proceedings. Cost Accounting Standards Claim As previously disclosed, in December 2013, a Divisional Administrative Contracting Officer of the United States Defense Contract Management Agency asserted a claim against Pratt & Whitney to recover overpayments of approximately $177 million plus interest (approximately $72.4 million through December 31, 2017). The claim is based on Pratt & Whitney's alleged noncompliance with cost accounting standards from January 1, 2005 to December 31, 2012, due to its method of determining the cost of collaborator parts used in the calculation of material overhead costs for government contracts. On March 18, 2014, Pratt & Whitney filed an appeal to the Armed Services Board of Contract Appeals. Pratt & Whitney’s appeal is still pending and we continue to believe the government’s claim is without merit. German Tax Litigation As previously disclosed, UTC has been involved in administrative review proceedings with the German Tax Office, which concern approximately €215 million (approximately $256 million) of tax benefits that we have claimed related to a 1998 reorganization of the corporate structure of Otis operations in Germany. Upon audit, these tax benefits were disallowed by the German Tax Office. UTC estimates interest associated with the aforementioned tax benefits is an additional approximately €118 million (approximately $140 million). On August 3, 2012, we filed suit in the local German Tax Court (Berlin-Brandenburg). In March 2016, the local German Tax Court dismissed our suit, and we have appealed this decision to the German Federal Tax Court (FTC). In 2015, UTC made tax and interest payments to German tax authorities of €275 million (approximately $300 million) in order to avoid additional interest accruals pending final resolution of this matter. In the meantime, we continue vigorously to litigate this matter. Asbestos Matters As previously disclosed, like many other industrial companies, we and our subsidiaries have been named as defendants in lawsuits alleging personal injury as a result of exposure to asbestos integrated into certain of our products or business premises. While we have never manufactured asbestos and no longer incorporate it in any currently-manufactured products, certain of our historical products, like those of many other manufacturers, have contained components incorporating asbestos. A substantial majority of these asbestos-related claims have been dismissed without payment or were covered in full or in part by insurance or other forms of indemnity. Additional cases were litigated and settled without any insurance reimbursement. The amounts involved in asbestos related claims were not material individually or in the aggregate in any year. Our estimated total liability to resolve all pending and unasserted potential future asbestos claims through 2059 is approximately $344 million and is principally recorded in Other long-term liabilities on our Consolidated Balance Sheet as of December 31, 2017. This amount is on a pre-tax basis, not discounted, and excludes the Company’s legal fees to defend the asbestos claims (which will continue to be expensed by the Company as they are incurred). In addition, the Company has an insurance recovery receivable for probable asbestos related recoveries of approximately $120 million, which is included primarily in Other assets on our Consolidated Balance Sheet as of December 31, 2017. The amounts recorded by UTC for asbestos-related liabilities and insurance recoveries are based on currently available information and assumptions that we believe are reasonable. Our actual liabilities or insurance recoveries could be higher or lower than those recorded if actual results vary significantly from the assumptions. Key variables in these assumptions include the number and type of new claims to be filed each year, the outcomes or resolution of such claims, the average cost of resolution of each new claim, the amount of insurance available, allocation methodologies, the contractual terms with each insurer with whom we have reached settlements, the resolution of coverage issues with other excess insurance carriers with whom we have not yet achieved settlements, and the solvency risk with respect to our insurance carriers. Other factors that may affect our future liability include uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, legal rulings that may be made by state and federal courts, and the passage of state or federal legislation. At the end of each year, the Company will evaluate all of these factors and, with input from an outside actuarial expert, make any necessary adjustments to both our estimated asbestos liabilities and insurance recoveries. Other. As described in Note 17 to the Consolidated Financial Statements, we extend performance and operating cost guarantees beyond our normal warranty and service policies for extended periods on some of our products. We have accrued our estimate of the liability that may result under these guarantees and for service costs that are probable and can be reasonably estimated. We also have other commitments and contingent liabilities related to legal proceedings, self-insurance programs and matters arising out of the normal course of business. We accrue contingencies based upon a range of possible outcomes. If no amount within this range is a better estimate than any other, then we accrue the minimum amount. Of note, the design, development, production and support of new aerospace technologies is inherently complex and subject to risk. Since the PurePower PW1000G Geared TurboFan engine entered into service in 2016, technical issues have been identified and experienced with the engine, which is usual for new engines and new aerospace technologies. Pratt & Whitney has addressed these issues through various improvements and modifications. These issues have resulted in financial impacts, including increased warranty provisions, customer contract settlements, and reductions in contract performance estimates. Additional technical issues have been identified, for which a reasonable estimate of the impact cannot currently be made, and such issues may also arise in the normal course, which may result in financial impacts that could be material to the Company’s financial position, results of operations and cash flows. In the ordinary course of business, the Company and its subsidiaries are also routinely defendants in, parties to or otherwise subject to many pending and threatened legal actions, claims, disputes and proceedings. These matters are often based on alleged violations of contract, product liability, warranty, regulatory, environmental, health and safety, employment, intellectual property, tax and other laws. In some of these proceedings, claims for substantial monetary damages are asserted against the Company and its subsidiaries and could result in fines, penalties, compensatory or treble damages or non-monetary relief. We do not believe that these matters will have a material adverse effect upon our competitive position, results of operations, cash flows or financial condition.

Segment Financial Data

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Segment Financial Data

SEGMENT FINANCIAL DATA

Our operations for the periods presented herein are classified into four principal segments. The segments are generally determined based on the management structure of the businesses and the grouping of similar operating companies, where each management organization has general operating autonomy over diversified products and services.

As discussed in Note 3, on November 6, 2015, we completed the sale of Sikorsky to Lockheed Martin Corp. The tables below exclude amounts attributable to Sikorsky, which have been reclassified to Discontinued Operations in the accompanying Consolidated Statement of Operations.

Otis products include elevators, escalators, moving walkways and service sold to customers in the commercial and residential property industries around the world.

UTC Climate, Controls & Security products and related services include HVAC and refrigeration systems, building controls and automation, fire and special hazard suppression systems and equipment, security monitoring and rapid response systems, provided to a diversified international customer base principally in the industrial, commercial and residential property and commercial transportation sectors.

Pratt & Whitney products include commercial, military, business jet and general aviation aircraft engines, parts and services sold to a diversified customer base, including international and domestic commercial airlines and aircraft leasing companies, aircraft manufacturers, and U.S. and foreign governments. Pratt & Whitney also provides product support and a full range of overhaul, repair and fleet management services.

UTC Aerospace Systems provides aerospace products and aftermarket services for commercial, military, business jet and general aviation customers worldwide. Products include electric power generation, power management and distribution systems, air data and flight sensing and management systems, engine control systems, electric systems, intelligence, surveillance and reconnaissance systems, engine components, environmental control systems, fire and ice detection and protection systems, propeller systems, aircraft aerostructures including engine nacelles, thrust reversers, and mounting pylons, interior and exterior aircraft lighting, aircraft seating and cargo systems, actuation systems, landing systems, including landing gears, wheels and brakes, and space products and subsystems. Aftermarket services include spare parts, overhaul and repair, engineering and technical support and fleet management solutions.

We have reported our financial and operational results for the periods presented herein under the four principal segments noted above, consistent with how we have reviewed our business operations for decision-making purposes, resource allocation and performance assessment during 2017.

Segment Information. Total sales by segment include intersegment sales, which are generally made at prices approximating those that the selling entity is able to obtain on external sales. Segment information for the years ended December 31 is as follows:



	Net Sales									Operating Profits
(dollars in millions)	2017			2016			2015			2017			2016			2015
Otis	$	12,341		$	11,893		$	11,980		$	2,021		$	2,147		$	2,338
UTC Climate, Controls & Security	17,812			16,851			16,707			3,300			2,956			2,936
Pratt & Whitney	16,160			14,894			14,082			1,460			1,545			861
UTC Aerospace Systems	14,691			14,465			14,094			2,370			2,298			1,888
Total segment	61,004			58,103			56,863			9,151			8,946			8,023
Eliminations and other	(1,167		)	(859		)	(765		)	(38		)	(368		)	(268		)
General corporate expenses	—			—			—			(441		)	(406		)	(464		)
Consolidated	$	59,837		$	57,244		$	56,098		$	8,672		$	8,172		$	7,291



	Total Assets						Capital Expenditures						Depreciation & Amortization
(dollars in millions)	2017		2016		2015		2017		2016		2015		2017		2016		2015
Otis	$	9,421	$	8,867	$	8,846	$	133	$	94	$	83	$	177	$	171	$	176
UTC Climate, Controls & Security	22,657		21,787		21,287		326		340		261		372		354		337
Pratt & Whitney	26,768		22,971		20,336		923		725		692		672		550		476
UTC Aerospace Systems	34,567		34,093		34,736		527		452		537		823		807		796
Total segment	93,413		87,718		85,205		1,909		1,611		1,573		2,044		1,882		1,785
Eliminations and other	3,507		1,988		2,279		105		88		79		96		80		78
Consolidated	$	96,920	$	89,706	$	87,484	$	2,014	$	1,699	$	1,652	$	2,140	$	1,962	$	1,863

Geographic External Sales and Operating Profit. Geographic external sales and operating profits are attributed to the geographic regions based on their location of origin. U.S. external sales include export sales to commercial customers outside the U.S. and sales to the U.S. Government, commercial and affiliated customers, which are known to be for resale to customers outside the U.S. Long-lived assets are net fixed assets attributed to the specific geographic regions.



	External Net Sales						Operating Profits									Long-Lived Assets
(dollars in millions)	2017		2016		2015		2017			2016			2015			2017		2016		2015
United States Operations	$	33,912	$	32,335	$	30,989	$	4,528		$	4,566		$	4,391		$	5,323	$	4,822	$	4,517
International Operations
Europe	11,879		11,151		10,945		2,058			1,933			1,882			1,817		1,538		1,525
Asia Pacific	8,770		8,260		8,425		1,488			1,484			1,641			1,113		999		994
Other	5,262		5,479		5,584		1,077			963			109			1,389		1,325		1,273
Eliminations and other	14		19		155		(479		)	(774		)	(732		)	544		474		423
Consolidated	$	59,837	$	57,244	$	56,098	$	8,672		$	8,172		$	7,291		$	10,186	$	9,158	$	8,732

Sales from U.S. operations include export sales as follows:



(dollars in millions)	2017		2016		2015
Europe	$	5,273	$	5,065	$	4,366
Asia Pacific	3,634		3,449		2,902
Other	2,217		2,313		2,473
	$	11,124	$	10,827	$	9,741

Major Customers. Net Sales include sales under prime contracts and subcontracts to the U.S. Government, primarily related to Pratt & Whitney and UTC Aerospace Systems products, as follows:



(dollars in millions)	2017		2016		2015
Pratt & Whitney	$	3,347	$	3,187	$	2,945
UTC Aerospace Systems	2,299		2,301		2,409
Other	152		138		276
	$	5,798	$	5,626	$	5,630

Net sales by Sikorsky under prime contracts and subcontracts to the U.S. Government of approximately $3.1 billion have been reclassified to Discontinued Operations in our Consolidated Statement of Operations for the year ended December 31, 2015.

Net sales to Airbus, primarily related to Pratt & Whitney and UTC Aerospace Systems products, were approximately $8,908 million, $7,688 million and $7,624 million for the years ended December 31, 2017, 2016 and 2015, respectively.

Selected Quarterly Financial Data - Unaudited

12 Months Ended

Dec. 31, 2017

Selected Quarterly Financial Information [Abstract]

Quarterly Financial Information [Text Block]

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)



	2017 Quarters								2016 Quarters
(dollars in millions, except per share amounts)	First		Second		Third		Fourth		First		Second		Third		Fourth
Net Sales	$	13,815	$	15,280	$	15,062	$	15,680	$	13,357	$	14,874	$	14,354	$	14,659
Gross margin	3,738		4,180		4,019		3,947		3,703		4,133		4,012		3,936
Net income attributable to common shareowners	1,386		1,439		1,330		397		1,183		1,379		1,480		1,013
Earnings per share of Common Stock:
Basic - net income	$	1.75	$	1.83	$	1.69	$	0.50	$	1.43	$	1.67	$	1.80	$	1.26
Diluted - net income	$	1.73	$	1.80	$	1.67	$	0.50	$	1.42	$	1.65	$	1.78	$	1.25

COMPARATIVE STOCK DATA (UNAUDITED)



	2017						2016
(common stock)	High		Low		Dividend		High		Low		Dividend
First quarter	$	113.68	$	108.18	$	0.66	$	100.25	$	84.66	$	0.64
Second quarter	$	122.50	$	111.93	$	0.66	$	105.89	$	97.21	$	0.66
Third quarter	$	123.71	$	109.55	$	0.70	$	109.69	$	100.10	$	0.66
Fourth quarter	$	128.12	$	116.38	$	0.70	$	110.98	$	98.67	$	0.66

Our common stock is listed on the New York Stock Exchange. The high and low prices are based on the Composite Tape of the New York Stock Exchange. There were approximately 18,393 registered shareholders at January 31, 2018.

Performance Graph - Unaudited

12 Months Ended

Dec. 31, 2017

Performance Graph [Abstract]

Cumulative Total Shareholder Return [Text Block]

PERFORMANCE GRAPH (UNAUDITED)

The following graph presents the cumulative total shareholder return for the five years ending December 31, 2017 for our common stock, as compared to the Standard & Poor's 500 Stock Index and to the Dow Jones 30 Industrial Average. Our common stock price is a component of both indices. These figures assume that all dividends paid over the five-year period were reinvested, and that the starting value of each index and the investment in common stock was $100.00 on December 31, 2012.

COMPARISON OF CUMULATIVE FIVE YEAR TOTAL RETURN



	December
	2012		2013		2014		2015		2016		2017
United Technologies Corporation	$	100.00	$	141.87	$	146.39	$	125.30	$	146.66	$	174.62
S&P 500 Index	$	100.00	$	132.39	$	150.51	$	152.59	$	170.84	$	208.14
Dow Jones Industrial Average	$	100.00	$	129.65	$	142.67	$	142.98	$	166.56	$	213.38

Summary of Accounting Principles (Policy)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Consolidation Policy [Text Block]

Consolidation. The Consolidated Financial Statements include the accounts of United Technologies Corporation (UTC) and its controlled subsidiaries. Intercompany transactions have been eliminated.

Cash And Cash Equivalents Policy [Text Block]

Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy

Accounts Receivable Policy [Text Block]

Marketable Equity Securities Policy

Inventories and Contracts in Progress Policy Text Block

Equity Method Investments Policy [Policy Text Block]

Goodwill And Intangible Assets Policy [Text Block]



Collaboration assets	30 years
Customer relationships and related programs	1 to 50 years
Purchased service contracts	5 to 25 years
Patents & trademarks	4 to 40 years
Exclusivity assets	5 to 25 years

Other Long Lived Assets Policy [Text Block]

Long-Term Financing Receivables Policy [Text Block]



(dollars in millions)	2017		2016
Long-term trade accounts receivable	$	973	$	926
Notes and leases receivable	424		430
Total long-term receivables	$	1,397	$	1,356

Income Tax Policy [Text Block]

Revenue Recognition Policy

Revenue Recognition, Cash Payments to Customers [Policy Text Block]

Research and Development Policy [Text Block]

Foreign Currency Transactions And Translations Policy [Text Block]

Derivatives and Hedging Activity Policy [Text Block]

Environmental Costs Policy

Pension and Postretirement Obligations Policy

Product Performance Obligations [Policy Text Block]

Collaborative Arrangements Policy



(dollars in millions)	2017			2016			2015
Collaborator share of sales:
Cost of products sold	$	1,789		$	1,700		$	1,547
Cost of services sold	929			675			652
Collaborator share of program costs (reimbursement of expenses incurred):
Cost of products sold	(143		)	(108		)	(104		)
Research and development	(190		)	(184		)	(248		)
Selling, general and administrative	(74		)	(57		)	(53		)

Business Acquisitions, Dispositions, Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]

Schedule of Goodwill [Table Text Block]



(dollars in millions)	Balance as of January 1, 2017		Goodwill resulting from business combinations		Foreign currency translation and other		Balance as of December 31, 2017
Otis	$	1,575	$	28	$	134	$	1,737
UTC Climate, Controls & Security	9,487		130		392		10,009
Pratt & Whitney	1,511		—		—		1,511
UTC Aerospace Systems	14,483		—		167		14,650
Total Segments	27,056		158		693		27,907
Eliminations and other	3		—		—		3
Total	$	27,059	$	158	$	693	$	27,910

Intangible Assets Disclosure [Table Text Block]



	2017					2016
(dollars in millions)	Gross Amount		Accumulated Amortization			Gross Amount		Accumulated Amortization
Amortized:
Service portfolios	$	2,178	$	(1,534	)	$	1,995	$	(1,344	)
Patents and trademarks	399		(233		)	378		(201		)
Collaboration intangible assets	4,109		(384		)	3,724		(211		)
Customer relationships and other	13,352		(4,100		)	12,798		(3,480		)
	20,038		(6,251		)	18,895		(5,236		)
Unamortized:
Trademarks and other	2,096		—			2,025		—
Total	$	22,134	$	(6,251	)	$	20,920	$	(5,236	)

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]



(dollars in millions)	2018		2019		2020		2021		2022
Amortization expense	$	902	$	869	$	888	$	902	$	895

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]



(dollars in millions, except per share amounts; shares in millions)	2017		2016			2015
Net income attributable to common shareowners:
Net income from continuing operations	$	4,552	$	5,065		$	3,996
Net (loss) income from discontinued operations	—		(10		)	3,612
Net income attributable to common shareowners	$	4,552	$	5,055		$	7,608
Basic weighted average number of shares outstanding	790.0		818.2			872.7
Stock awards	9.1		7.9			10.5
Diluted weighted average number of shares outstanding	799.1		826.1			883.2
Earnings Per Share of Common Stock—Basic:
Net income from continuing operations	$	5.76	$	6.19		$	4.58
Net (loss) income from discontinued operations	—		(0.01		)	4.14
Net income attributable to common shareowners	5.76		6.18			8.72
Earnings Per Share of Common Stock—Diluted:
Net income from continuing operations	$	5.70	$	6.13		$	4.53
Net (loss) income from discontinued operations	—		(0.01		)	4.09
Net income attributable to common shareowners	5.70		6.12			8.61

Commercial Aerospace Industry Assets and Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Other Commitments [Abstract]

Commercial Aerospace Industry Assets and Commitments [Table Text Block]

The following is the expected maturity of commercial aerospace industry assets and commitments as of December 31, 2017:



(dollars in millions)	Committed			2018			2019			2020			2021			2022			Thereafter
Notes and leases receivable	$	652		$	211		$	56		$	79		$	38		$	35		$	233
Commercial aerospace financing commitments	$	4,012		$	371		$	678		$	636		$	891		$	783		$	653
Other commercial aerospace commitments	11,270			910			840			684			735			645			7,456
Collaboration partners' share	(5,109		)	(374		)	(402		)	(396		)	(525		)	(491		)	(2,921		)
Total commercial commitments	$	10,173		$	907		$	1,116		$	924		$	1,101		$	937		$	5,188

Inventories and Contracts in Progress (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventory Table [Table Text Block]



(dollars in millions)	2017			2016
Raw materials	$	2,038		$	2,040
Work-in-process	3,366			2,787
Finished goods	3,845			3,305
Contracts in progress	10,205			9,395
	19,454			17,527
Less:
Progress payments, secured by lien, on U.S. Government contracts	(236		)	(130		)
Billings on contracts in progress	(9,337		)	(8,693		)
	$	9,881		$	8,704

Fixed Assets (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Fixed Assets [Text Block]



(dollars in millions)	Estimated Useful Lives	2017			2016
Land		$	412		$	392
Buildings and improvements	12-40 years	5,727			5,180
Machinery, tools and equipment	3-20 years	13,476			12,471
Other, including assets under construction		1,749			1,426
		21,364			19,469
Accumulated depreciation		(11,178		)	(10,311		)
		$	10,186		$	9,158

Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Accrued Liabilities [Abstract]

Schedule of Accrued Liabilities Table [Text Block]



(dollars in millions)	2017		2016
Advances on sales contracts and service billings	$	4,547	$	4,217
Accrued salaries, wages and employee benefits	1,741		1,608
Service and warranty accruals	629		555
Interest payable	439		395
Litigation and contract matters	435		488
Income taxes payable	285		382
Accrued property, sales and use taxes	258		289
Canadian government settlement - current portion	217		245
Accrued restructuring costs	212		210
Accrued workers compensation	204		208
Other	3,349		3,622
	$	12,316	$	12,219

Borrowings and Lines of Credit (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Short-term Debt [Table Text Block]



(dollars in millions)	2017		2016
Short-term borrowings:
Commercial paper	$	300	$	522
Other borrowings	92		79
Total short-term borrowings	$	392	$	601

Schedule of Weighted average interest rates [Table Text Block]

The weighted-average interest rates applicable to short-term borrowings and total debt were as follows:



	2017		2016
Average interest expense rate - average outstanding borrowings during the year:
Short-term borrowings	1.1	%	1.3	%
Total debt	3.5	%	4.1	%

Average interest expense rate - outstanding borrowings as of December 31:
Short-term borrowings	2.3	%	0.6	%
Total debt	3.5	%	3.7	%

Long-term Debt [Table Text Block]



(dollars in millions)	2017			2016
1.800% notes due 2017 ¹	—			1,500
6.800% notes due 2018	99			99
EURIBOR plus 0.80% floating rate notes due 2018 (€750 million principal value) ²	890			783
1.778% junior subordinated notes due 2018	1,100			1,100
LIBOR plus 0.350% floating rate notes due 2019 ³	350			350
1.500% notes due 2019 ¹	650			650
EURIBOR plus 0.15% floating rate notes due 2019 (€750 million principal value) ²	890			—
8.875% notes due 2019	271			271
4.875% notes due 2020 ¹	171			171
4.500% notes due 2020 ¹	1,250			1,250
1.900% notes due 2020 ¹	1,000			—
8.750% notes due 2021	250			250
1.950% notes due 2021 ¹	750			750
1.125% notes due 2021 (€950 million principal value) ¹	1,127			992
2.300% notes due 2022 ¹	500			—
3.100% notes due 2022 ¹	2,300			2,300
1.250% notes due 2023 (€750 million principal value) ¹	890			783
2.800% notes due 2024 ¹	800			—
1.875% notes due 2026 (€500 million principal value) ¹	593			522
2.650% notes due 2026 ¹	1,150			1,150
3.125% notes due 2027 ¹	1,100			—
7.100% notes due 2027	141			141
6.700% notes due 2028	400			400
7.500% notes due 2029 ¹	550			550
5.400% notes due 2035 ¹	600			600
6.050% notes due 2036 ¹	600			600
6.800% notes due 2036 ¹	134			134
7.000% notes due 2038	159			159
6.125% notes due 2038 ¹	1,000			1,000
5.700% notes due 2040 ¹	1,000			1,000
4.500% notes due 2042 ¹	3,500			3,500
4.150% notes due 2045 ¹	850			850
3.750% notes due 2046 ¹	1,100			1,100
4.050% notes due 2047 ¹	600			—
Project financing obligations	158			155
Other (including capitalized leases)	195			189
Total principal long-term debt	27,118			23,299
Other (fair market value adjustments, discounts and debt issuance costs)	(25		)	1
Total long-term debt	27,093			23,300
Less: current portion	2,104			1,603
Long-term debt, net of current portion	$	24,989		$	21,697


1	We may redeem these notes at our option pursuant to their terms.


2	The three-month EURIBOR rate as of December 29, 2017 was approximately -0.329%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.


3	The three-month LIBOR rate as of December 29, 2017 was approximately 1.694%.

Schedule of Principal Payments on Long-term Debt [Table Text Block]



(dollars in millions)
2018	$	2,104
2019	2,271
2020	2,479
2021	2,175
2022	2,804
Thereafter	15,285
Total	$	27,118

Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity Note [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

A summary of the changes in each component of accumulated other comprehensive (loss) income, net of tax for the years ended December 31, 2017 and 2016 is provided below:



(dollars in millions)	Foreign Currency Translation			Defined Benefit Pension and Postretirement Plans			Unrealized Gains (Losses) on Available-for- Sale Securities			Unrealized Hedging (Losses) Gains			Accumulated Other Comprehensive (Loss) Income
Balance at December 31, 2015	$	(2,438	)	$	(5,135	)	$	293		$	(339	)	$	(7,619	)
Other comprehensive (loss) income before reclassifications, net	(1,042		)	(247		)	119			54			(1,116		)
Amounts reclassified, pre-tax	—			535			(94		)	171			612
Tax (benefit) expense reclassified	—			(198		)	35			(48		)	(211		)
Balance at December 31, 2016	$	(3,480	)	$	(5,045	)	$	353		$	(162	)	$	(8,334	)
Other comprehensive income before reclassifications, net	540			78			3			264			885
Amounts reclassified, pre-tax	(10		)	529			(566		)	(39		)	(86		)
Tax (benefit) expense reclassified	—			(214		)	215			9			10
Balance at December 31, 2017	$	(2,950	)	$	(4,652	)	$	5		$	72		$	(7,525	)

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Notes to Consolidated Financial Statements [Abstract]

Schedule of Income before Income Tax Domestic and Foreign [Table Text Block]

The sources of income from continuing operations before income taxes are:



(dollars in millions)	2017		2016		2015
United States	$	2,990	$	2,534	$	2,782
Foreign	4,773		4,599		3,685
	$	7,763	$	7,133	$	6,467

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The income tax expense (benefit) for the years ended December 31, 2017, 2016 and 2015 consisted of the following components:



(dollars in millions)	2017			2016			2015
Current:
United States:
Federal	$	1,577		$	30		$	328
State	64			(21		)	(37		)
Foreign	1,140			1,290			1,158
	2,781			1,299			1,449
Future:
United States:
Federal	(27		)	318			712
State	84			134			109
Foreign	5			(54		)	(159		)
	62			398			662
Income tax expense	$	2,843		$	1,697		$	2,111
Attributable to items credited (charged) to equity	$	(128	)	$	(299	)	$	(114	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Differences between effective income tax rates and the statutory U.S. federal income tax rate are as follows:



	2017		2016		2015
Statutory U.S. federal income tax rate	35.0	%	35.0	%	35.0	%
Tax on international activities	(6.4	)%	(8.1	)%	(2.0	)%
Tax audit settlements	(0.7	)%	(2.9	)%	—
U.S. tax reform	8.9	%	—		—
Other	(0.2	)%	(0.2	)%	(0.4	)%
Effective income tax rate	36.6	%	23.8	%	32.6	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The tax effects of temporary differences and tax carryforwards which gave rise to future income tax benefits and payables at December 31, 2017 and 2016 are as follows:



(dollars in millions)	2017			2016
Future income tax benefits:
Insurance and employee benefits	$	928		$	2,382
Other asset basis differences	798			1,098
Other liability basis differences	1,158			1,403
Tax loss carryforwards	544			494
Tax credit carryforwards	948			873
Valuation allowances	(582		)	(545		)
	$	3,794		$	5,705
Future income taxes payable:
Other asset basis differences	$	3,415		$	5,376
Other items, net	411			364
	$	3,826		$	5,740

Summary Of Tax Credit Carryforwards [Table Text Block]

At December 31, 2017, tax credit carryforwards, principally state and foreign, and tax loss carryforwards, principally state and foreign, were as follows:



(dollars in millions)	Tax Credit Carryforwards		Tax Loss Carryforwards
Expiration period:
2018-2022	$	22	$	307
2023-2027	33		218
2028-2037	269		359
Indefinite	624		1,942
Total	$	948	$	2,826

Summary Of Income Tax Contingencies [Table Text Block]

A reconciliation of the beginning and ending amounts of unrecognized tax benefits and interest expense related to unrecognized tax benefits for the years ended December 31, 2017, 2016 and 2015 is as follows:



(dollars in millions)	2017			2016			2015
Balance at January 1	$	1,086		$	1,169		$	1,089
Additions for tax positions related to the current year	192			69			206
Additions for tax positions of prior years	73			167			99
Reductions for tax positions of prior years	(91		)	(61		)	(101		)
Settlements	(71		)	(258		)	(124		)
Balance at December 31	$	1,189		$	1,086		$	1,169
Gross interest expense related to unrecognized tax benefits	$	34		$	41		$	39
Total accrued interest balance at December 31	$	215		$	185		$	176

Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule Of Multiemployer Plans Table [Text Block]



(dollars in millions)		Pension Protection Act Zone Status		FIP/ RP Status	Contributions
Pension Fund	EIN/Pension Plan Number	2017	2016	Pending/ Implemented	2017		2016		2015		Surcharge Imposed	Expiration Date of Collective-Bargaining Agreement
National Elevator Industry Pension Plan	23-2694291	Green	Green	No	$	114	$	100	$	88	No	July 8, 2022
Other funds					31		31		32
					$	145	$	131	$	120

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

We measure the cost of all share-based payments, including stock options, at fair value on the grant date and recognize this cost in the Consolidated Statement of Operations as follows:



(dollars in millions)	2017		2016		2015
Continuing operations	$	192	$	152	$	158
Discontinued operations	—		1		17
Total compensation cost recognized	$	192	$	153	$	175

Schedule of Stock Options Roll Forward [Table Text Block]

A summary of the transactions under all long-term incentive plans for the year ended December 31, 2017 follows:



	Stock Options				Stock Appreciation Rights				Performance Share Units				Other Incentive Shares/Units
(shares and units in thousands)	Shares		Average Price*		Shares		Average Price*		Units		Average Price**		Other Incentive Shares/Units
Outstanding at:
December 31, 2016	2,023		$	89.72	36,413		$	87.18	1,967		$	107.05	2,033
Granted	231		110.81		3,464		110.91		614		110.83		1,006
Exercised / earned	(369	)	77.17		(6,770	)	72.86		(2	)	107.78		(441	)
Cancelled	(103	)	102.00		(720	)	95.23		(699	)	112.16		(123	)
Other	(37	)	$	94.30	335		$	92.54	(4	)	$	106.38	(293	)
December 31, 2017	1,745		$	94.35	32,722		$	92.54	1,876		$	106.38	2,182


*	weighted-average exercise price


**	weighted-average grant stock price

Disclosure Of Share Based Compensation Arrangements By Share Based Payment Award Text Block

The following table summarizes information about equity awards outstanding that are vested and expected to vest and equity awards outstanding that are exercisable at December 31, 2017:



	Equity Awards Vested and Expected to Vest						Equity Awards That Are Exercisable
(shares in thousands; aggregate intrinsic value in millions)	Awards	Average Price*		Aggregate Intrinsic Value		Remaining Term**	Awards	Average Price*		Aggregate Intrinsic Value		Remaining Term**
Stock Options/Stock Appreciation Rights	34,183	$	91.85	$	1,221	5.5 years	21,990	$	84.34	$	951	4.2 years
Performance Share Units/Restricted Stock	3,462	—		442		2.1 years


*	weighted-average exercise price per share


**	weighted-average contractual remaining term in years

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following table indicates the assumptions used in estimating fair value for the years ended December 31, 2017, 2016 and 2015. Lattice-based option models incorporate ranges of assumptions for inputs; those ranges are as follows:



	2017		2016		2015
Expected volatility	19	%	20%		20% - 23%
Weighted-average volatility	19	%	20	%	21	%
Expected term (in years)	6.5		6.5		6.0 - 6.8
Expected dividend yield	2.4	%	2.7	%	2.2	%
Risk-free rate	0.5% - 2.5%		0.2% - 2.6%		0.0% - 2.2%

Pension Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Defined Benefit Plans Disclosures [Text Block]



(dollars in millions)	2017			2016
Change in Benefit Obligation:
Beginning balance	$	34,923		$	35,428
Service cost	374			383
Interest cost	1,120			1,183
Actuarial loss	1,804			1,831
Total benefits paid	(1,782		)	(1,660		)
Net settlement, curtailment and special termination benefits	(49		)	(1,566		)
Other	609			(676		)
Ending balance	$	36,999		$	34,923

Change in Plan Assets:
Beginning balance	$	30,555		$	31,011
Actual return on plan assets	4,258			3,202
Employer contributions	2,188			384
Benefits paid	(1,782		)	(1,660		)
Settlements	(41		)	(1,632		)
Other	511			(750		)
Ending balance	$	35,689		$	30,555

Funded Status:
Fair value of plan assets	$	35,689		$	30,555
Benefit obligations	(36,999		)	(34,923		)
Funded status of plan	$	(1,310	)	$	(4,368	)

Amounts Recognized in the Consolidated Balance Sheet Consist of:
Noncurrent assets	$	957		$	451
Current liability	(70		)	(72		)
Noncurrent liability	(2,197		)	(4,747		)
Net amount recognized	$	(1,310	)	$	(4,368	)

Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:
Net actuarial loss	$	7,238		$	7,941
Prior service cost (credit)	37			(6		)
Net amount recognized	$	7,275		$	7,935

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

Information for pension plans with accumulated benefit obligations in excess of plan assets:



(dollars in millions)	2017		2016
Projected benefit obligation	$	22,360	$	32,732
Accumulated benefit obligation	22,159		32,095
Fair value of plan assets	20,438		27,943

Schedule of Net Benefit Costs [Table Text Block]

The components of the net periodic pension (benefit) cost are as follows:



(dollars in millions)	2017			2016			2015
Pension Benefits:
Service cost	$	374		$	383		$	493
Interest cost	1,120			1,183			1,399
Expected return on plan assets	(2,215		)	(2,202		)	(2,264		)
Amortization of prior service credit	(36		)	(33		)	(11		)
Recognized actuarial net loss	575			572			882
Net settlement, curtailment and special termination benefits loss	3			498			150
Net periodic pension (benefit) cost - employer	$	(179	)	$	401		$	649

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Other changes in plan assets and benefit obligations recognized in other comprehensive loss in 2017 are as follows:



(dollars in millions)
Current year actuarial gain	$	(239	)
Amortization of actuarial loss	(575		)
Current year prior service cost	4
Amortization of prior service credit	36
Net settlement and curtailment loss	(11		)
Other	125
Total recognized in other comprehensive loss	$	(660	)
Net recognized in net periodic pension (benefit) cost and other comprehensive loss	$	(839	)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension (benefit) cost in 2018 is as follows:



(dollars in millions)
Net actuarial loss	$	402
Prior service credit	(41		)
	$	361

Schedule of Assumptions Used [Table Text Block]

Major assumptions used in determining the benefit obligation and net cost for pension plans are presented in the following table as weighted-averages:



	Benefit Obligation				Net Cost
	2017		2016		2017		2016		2015
Discount rate
PBO	3.4	%	3.8	%	3.8	%	4.1	%	3.8	%
Interest cost¹	—		—		3.3	%	3.4	%	—
Service cost¹	—		—		3.6	%	3.8	%	—
Salary scale	4.2	%	4.1	%	4.1	%	4.2	%	4.2	%
Expected return on plan assets	—		—		7.3	%	7.3	%	7.6	%


Note 1	The 2017 and 2016 discount rates used to measure the service cost and interest cost applies to our significant plans. The PBO discount rate is used for the service cost and interest cost measurements for non-significant plans.

Schedule of Allocation of Plan Assets [Table Text Block]

The fair values of pension plan assets at December 31, 2017 and 2016 by asset category are as follows:



(dollars in millions)	Quoted Prices in Active Markets For Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Not Subject to Leveling		Total
Asset Category:
Public Equities
Global Equities	$	3,129	$	3	$	—	$	—	$	3,132
Global Equity Commingled Funds¹	—		1,084		—		—		1,084
Enhanced Global Equities²	213		819		—		—		1,032
Global Equity Funds at net asset value⁸	—		—		—		7,599		7,599
Private Equities^3,8	—		—		46		1,170		1,216
Fixed Income Securities
Governments	1,445		69		—		—		1,514
Corporate Bonds	—		10,929		—		—		10,929
Fixed Income Securities⁸	—		—		—		3,519		3,519
Real Estate^4,8	—		15		1,446		396		1,857
Other^5,8	—		287		—		2,509		2,796
Cash & Cash Equivalents^6,8	—		79		—		498		577
Subtotal	$	4,787	$	13,285	$	1,492	$	15,691	35,255
Other Assets & Liabilities⁷									434
Total at December 31, 2017									$	35,689
Public Equities
Global Equities	$	4,682	$	3	$	—	$	—	$	4,685
Global Equity Commingled Funds¹	—		367		—		—		367
Enhanced Global Equities²	168		1,494		—		—		1,662
Global Equity Funds at net asset value ⁸	—		—		—		7,090		7,090
Private Equities^3,8	—		—		122		1,239		1,361
Fixed Income Securities
Governments	260		54		—		—		314
Corporate Bonds	—		7,637		—		—		7,637
Fixed Income Securities⁸	—		—		—		2,788		2,788
Real Estate^4,8	—		17		1,285		513		1,815
Other^5,8	—		289		—		1,819		2,108
Cash & Cash Equivalents^6,8	100		75		—		121		296
Subtotal	$	5,210	$	9,936	$	1,407	$	13,570	30,123
Other Assets & Liabilities⁷									432
Total at December 31, 2016									$	30,555


Note 1	Represents commingled funds that invest primarily in common stocks.


Note 2	Represents enhanced equity separate account and commingled fund portfolios. A portion of the portfolio may include long-short market neutral and relative value strategies that invest in publicly traded, equity and fixed income securities, as well as derivatives of equity and fixed income securities and foreign currency.


Note 3	Represents limited partner investments with general partners that primarily invest in debt and equity.


Note 4	Represents investments in real estate including commingled funds and directly held properties.


Note 5	Represents insurance contracts and global balanced risk commingled funds consisting mainly of equity, bonds and some commodities.


Note 6	Represents short-term commercial paper, bonds and other cash or cash-like instruments.


Note 7	Represents trust receivables and payables that are not leveled.

Note 8

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

The fair value measurement of plan assets using significant unobservable inputs (Level 3) changed due to the following:



(dollars in millions)	Private Equities			Real Estate		Total
Balance, December 31, 2015	$	182		$	1,165	$	1,347
Realized gains	46			19		65
Unrealized gains relating to instruments still held in the reporting period	5			18		23
Purchases, sales, and settlements, net	(111		)	83		(28		)
Balance, December 31, 2016	122			1,285		1,407
Realized gains	61			31		92
Unrealized (losses) gains relating to instruments still held in the reporting period	(47		)	17		(30		)
Purchases, sales, and settlements, net	(90		)	113		23
Balance, December 31, 2017	$	46		$	1,446	$	1,492

Other Postretirement Benefits Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Defined Benefit Plans Disclosures [Text Block]



(dollars in millions)	2017			2016
Change in Benefit Obligation:
Beginning balance	$	805		$	890
Service cost	2			3
Interest cost	29			34
Actuarial gain	(4		)	(48		)
Total benefits paid	(87		)	(97		)
Other	22			23
Ending balance	$	767		$	805

Change in Plan Assets:
Beginning balance	$	—		$	—
Employer contributions	71			80
Benefits paid	(87		)	(97		)
Other	16			17
Ending balance	$	—		$	—

Funded Status:
Fair value of plan assets	$	—		$	—
Benefit obligations	(767		)	(805		)
Funded status of plan	$	(767	)	$	(805	)

Amounts Recognized in the Consolidated Balance Sheet Consist of:
Current liability	$	(72	)	$	(78	)
Noncurrent liability	(695		)	(727		)
Net amount recognized	$	(767	)	$	(805	)

Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:
Net actuarial gain	$	(143	)	$	(152	)
Prior service credit	(10		)	(5		)
Net amount recognized	$	(153	)	$	(157	)

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic benefit cost are as follows:



(dollars in millions)	2017			2016			2015
Other Postretirement Benefits:
Service cost	$	2		$	3		$	3
Interest cost	29			34			34
Amortization of prior service credit	(1		)	—			—
Recognized actuarial net gain	(9		)	(4		)	(4		)
Net settlement and curtailment gain	—			—			(1		)
Net periodic other postretirement benefit cost	$	21		$	33		$	32

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Other changes in plan assets and benefit obligations recognized in other comprehensive loss in 2017 are as follows:



(dollars in millions)
Current year actuarial gain	$	(2	)
Current year prior service credit	(6		)
Amortization of prior service credit	1
Amortization of actuarial net gain	9
Other	2
Total recognized in other comprehensive loss	$	4
Net recognized in net periodic other postretirement benefit cost and other comprehensive loss	$	25

Schedule of Assumptions Used [Table Text Block]

Major assumptions used in determining the benefit obligation and net cost for postretirement plans are presented in the following table as weighted-averages:



	Benefit Obligation				Net Cost
	2017		2016		2017		2016		2015
Discount rate	3.4	%	3.8	%	3.8	%	4.0	%	3.8	%

Schedule of Health Care Cost Trend Rates [Table Text Block]

Assumed health care cost trend rates are as follows:



	2017		2016
Health care cost trend rate assumed for next year	7.0	%	6.5	%
Rate that the cost trend rate gradually declines to	5.0	%	5.0	%
Year that the rate reaches the rate it is assumed to remain at	2026		2022

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

A one-percentage-point change in assumed health care cost trend rates would have the following effects:



	2017 One-Percentage-Point
(dollars in millions)	Increase		Decrease
Effect on total service and interest cost	$	2	$	(2	)
Effect on postretirement benefit obligation	40		(35		)

Restructuring and Other Costs (Tables)

12 Months Ended

Dec. 31, 2017

Restructuring Cost and Reserve [Line Items]

Schedule of Restructuring and Related Costs [Table Text Block]

Restructuring charges incurred in 2017 primarily relate to actions initiated during 2017 and 2016, and were recorded as follows:



(dollars in millions)
Cost of sales	$	119
Selling, general & administrative	134
Total	$	253

We recorded charges in the segments as follows:



(dollars in millions)
Otis	$	50
UTC Climate, Controls & Security	111
Pratt & Whitney	5
UTC Aerospace Systems	80
Eliminations and other	7
Total	$	253

Current Year Actions [Member]

Restructuring Cost and Reserve [Line Items]

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

The following table summarizes the accrual balances and utilization by cost type for the 2017 restructuring actions:



(dollars in millions)	Severance			Facility Exit, Lease Termination & Other Costs			Total
Net pre-tax restructuring costs	$	160		$	16		$	176
Utilization and foreign exchange	(76		)	(15		)	(91		)
Balance at December 31, 2017	$	84		$	1		$	85

Schedule of Restructuring and Related Costs [Table Text Block]

The following table summarizes expected, incurred and remaining costs for the 2017 restructuring actions by segment:



(dollars in millions)	Expected Costs		Cost Incurred During 2017			Remaining Costs at December 31, 2017
Otis	$	79	$	(43	)	$	36
UTC Climate, Controls & Security	87		(76		)	11
Pratt & Whitney	7		(7		)	—
UTC Aerospace Systems	118		(43		)	75
Eliminations and other	7		(7		)	—
Total	$	298	$	(176	)	$	122

Prior Year Actions [Member]

Restructuring Cost and Reserve [Line Items]

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

The following table summarizes the accrual balances and utilization by cost type for the 2016 restructuring actions:



(dollars in millions)	Severance			Facility Exit, Lease Termination and Other Costs			Total
Restructuring accruals at January 1, 2017	$	63		$	46		$	109
Net pre-tax restructuring costs	34			23			57
Utilization and foreign exchange	(65		)	(17		)	(82		)
Balance at December 31, 2017	$	32		$	52		$	84

Schedule of Restructuring and Related Costs [Table Text Block]

The following table summarizes expected, incurred and remaining costs for the 2016 programs by segment:



(dollars in millions)	Expected Costs		Costs Incurred During 2016			Costs Incurred During 2017			Remaining Costs at December 31, 2017
Otis	$	57	$	(48	)	$	(5	)	$	4
UTC Climate, Controls & Security	79		(45		)	(21		)	13
Pratt & Whitney	118		(118		)	—			—
UTC Aerospace Systems	79		(31		)	(31		)	17
Total	$	333	$	(242	)	$	(57	)	$	34

Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments, Gain (Loss) [Line Items]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The following table summarizes the fair value of derivative instruments as of December 31, 2017 and 2016, which consist solely of foreign exchange contracts:



	Asset Derivatives				Liability Derivatives
(dollars in millions)	2017		2016		2017		2016
Derivatives designated as hedging instruments	$	178	$	15	$	18	$	196
Derivatives not designated as hedging instruments	75		155		60		158

Reclassification out of Accumulated Other Comprehensive Income [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) [Table Text Block]

The impact from foreign exchange derivative instruments that qualified as cash flow hedges was as follows:



	Year Ended December 31,
(dollars in millions)	2017			2016
Gain recorded in Accumulated other comprehensive loss	$	347		$	75
(Gain) loss reclassified from Accumulated other comprehensive loss into Product sales (effective portion)	$	(39	)	$	171

Other Operating Income (Expense) [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) [Table Text Block]

The effect on the Consolidated Statement of Operations of foreign exchange contracts not designated as hedging instruments was as follows:



	Year Ended December 31,
(dollars in millions)	2017		2016
Gain recognized in Other income, net	$	77	$	56

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

tables provide the valuation hierarchy classification of assets and liabilities that are carried at fair value and measured on a recurring and nonrecurring basis in our Consolidated Balance Sheet as of December 31, 2017 and 2016:



2017 (dollars in millions)	Total			Level 1		Level 2			Level 3
Recurring fair value measurements:
Available-for-sale securities	$	64		$	64	$	—		$	—
Derivative assets	253			—		253			—
Derivative liabilities	(78		)	—		(78		)	—



2016 (dollars in millions)	Total			Level 1		Level 2			Level 3
Recurring fair value measurements:
Available-for-sale securities	$	987		$	987	$	—		$	—
Derivative assets	170			—		170			—
Derivative liabilities	(354		)	—		(354		)	—

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table provides carrying amounts and fair values of financial instruments that are not carried at fair value at December 31, 2017 and 2016:



	December 31, 2017						December 31, 2016
(dollars in millions)	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Long-term receivables	$	127		$	121		$	127		$	121
Customer financing notes receivable	609			596			437			420
Short-term borrowings	(392		)	(392		)	(600		)	(600		)
Long-term debt (excluding capitalized leases)	(27,067		)	(29,180		)	(23,280		)	(25,110		)
Long-term liabilities	(362		)	(330		)	(457		)	(427		)

The following table provides the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Consolidated Balance Sheet as of December 31, 2017:



(dollars in millions)	Total			Level 1		Level 2			Level 3
Long-term receivables	$	121		$	—	$	121		$	—
Customer financing notes receivable	596			—		596			—
Short-term borrowings	(392		)	—		(300		)	(92		)
Long-term debt (excluding capitalized leases)	(29,180		)	—		(28,970		)	(210		)
Long-term liabilities	(330		)	—		(330		)	—

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Variable Interest Entities (Tables)

12 Months Ended

Dec. 31, 2017

Variable Interest Entity [Line Items]

Schedule of Variable Interest Entities [Table Text Block]

The carrying amounts and classification of assets and liabilities for variable interest entities in our Consolidated Balance Sheet as of December 31, 2017 and 2016 are as follows:



(dollars in millions)	2017		2016
Current assets	$	3,976	$	2,722
Noncurrent assets	1,534		1,334
Total assets	$	5,510	$	4,056
Current liabilities	$	3,601	$	2,422
Noncurrent liabilities	2,086		1,636
Total liabilities	$	5,687	$	4,058

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Guarantees (Tables)

12 Months Ended

Dec. 31, 2017

Guarantees [Abstract]

Schedule of Guarantor Obligations [Table Text Block]

As of December 31, 2017 and 2016, the following financial guarantees were outstanding:



	December 31, 2017				December 31, 2016
(dollars in millions)	Maximum Potential Payment		Carrying Amount of Liability		Maximum Potential Payment		Carrying Amount of Liability
Commercial aerospace financing arrangements (see Note 5)	$	336	$	8	$	348	$	14
Credit facilities and debt obligations (expire 2018 to 2028)	256		15		270		15
Performance guarantees	56		2		55		4

Product Warranty Disclosure [Table Text Block]

The changes in the carrying amount of service and product warranties and product performance guarantees for the years ended December 31, 2017 and 2016 are as follows:



(dollars in millions)	2017			2016
Balance as of January 1	$	1,199		$	1,212
Warranties and performance guarantees issued	323			246
Settlements made	(207		)	(240		)
Other	9			(19		)
Balance as of December 31	$	1,324		$	1,199

Segment Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Schedule Of Segment Reporting Information By Segment [Table Text Block]



	Net Sales									Operating Profits
(dollars in millions)	2017			2016			2015			2017			2016			2015
Otis	$	12,341		$	11,893		$	11,980		$	2,021		$	2,147		$	2,338
UTC Climate, Controls & Security	17,812			16,851			16,707			3,300			2,956			2,936
Pratt & Whitney	16,160			14,894			14,082			1,460			1,545			861
UTC Aerospace Systems	14,691			14,465			14,094			2,370			2,298			1,888
Total segment	61,004			58,103			56,863			9,151			8,946			8,023
Eliminations and other	(1,167		)	(859		)	(765		)	(38		)	(368		)	(268		)
General corporate expenses	—			—			—			(441		)	(406		)	(464		)
Consolidated	$	59,837		$	57,244		$	56,098		$	8,672		$	8,172		$	7,291



	Total Assets						Capital Expenditures						Depreciation & Amortization
(dollars in millions)	2017		2016		2015		2017		2016		2015		2017		2016		2015
Otis	$	9,421	$	8,867	$	8,846	$	133	$	94	$	83	$	177	$	171	$	176
UTC Climate, Controls & Security	22,657		21,787		21,287		326		340		261		372		354		337
Pratt & Whitney	26,768		22,971		20,336		923		725		692		672		550		476
UTC Aerospace Systems	34,567		34,093		34,736		527		452		537		823		807		796
Total segment	93,413		87,718		85,205		1,909		1,611		1,573		2,044		1,882		1,785
Eliminations and other	3,507		1,988		2,279		105		88		79		96		80		78
Consolidated	$	96,920	$	89,706	$	87,484	$	2,014	$	1,699	$	1,652	$	2,140	$	1,962	$	1,863

Schedule of Revenues From External Customers And Long Lived Assets By Geographic Areas [Table Text Block]



	External Net Sales						Operating Profits									Long-Lived Assets
(dollars in millions)	2017		2016		2015		2017			2016			2015			2017		2016		2015
United States Operations	$	33,912	$	32,335	$	30,989	$	4,528		$	4,566		$	4,391		$	5,323	$	4,822	$	4,517
International Operations
Europe	11,879		11,151		10,945		2,058			1,933			1,882			1,817		1,538		1,525
Asia Pacific	8,770		8,260		8,425		1,488			1,484			1,641			1,113		999		994
Other	5,262		5,479		5,584		1,077			963			109			1,389		1,325		1,273
Eliminations and other	14		19		155		(479		)	(774		)	(732		)	544		474		423
Consolidated	$	59,837	$	57,244	$	56,098	$	8,672		$	8,172		$	7,291		$	10,186	$	9,158	$	8,732

Schedule Of Revenue By Major Customers By Reporting Segments [Table Text Block]



(dollars in millions)	2017		2016		2015
Pratt & Whitney	$	3,347	$	3,187	$	2,945
UTC Aerospace Systems	2,299		2,301		2,409
Other	152		138		276
	$	5,798	$	5,626	$	5,630

Revenue from External Customers by Geographic Areas [Table Text Block]



(dollars in millions)	2017		2016		2015
Europe	$	5,273	$	5,065	$	4,366
Asia Pacific	3,634		3,449		2,902
Other	2,217		2,313		2,473
	$	11,124	$	10,827	$	9,741

Selected Quarterly Financial Data - Unaudited (Tables)

12 Months Ended

Dec. 31, 2017

Selected Quarterly Financial Information [Abstract]

Schedule Of Quarterly Financial Information [Table Text Block]

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)



	2017 Quarters								2016 Quarters
(dollars in millions, except per share amounts)	First		Second		Third		Fourth		First		Second		Third		Fourth
Net Sales	$	13,815	$	15,280	$	15,062	$	15,680	$	13,357	$	14,874	$	14,354	$	14,659
Gross margin	3,738		4,180		4,019		3,947		3,703		4,133		4,012		3,936
Net income attributable to common shareowners	1,386		1,439		1,330		397		1,183		1,379		1,480		1,013
Earnings per share of Common Stock:
Basic - net income	$	1.75	$	1.83	$	1.69	$	0.50	$	1.43	$	1.67	$	1.80	$	1.26
Diluted - net income	$	1.73	$	1.80	$	1.67	$	0.50	$	1.42	$	1.65	$	1.78	$	1.25

COMPARATIVE STOCK DATA (UNAUDITED)



	2017						2016
(common stock)	High		Low		Dividend		High		Low		Dividend
First quarter	$	113.68	$	108.18	$	0.66	$	100.25	$	84.66	$	0.64
Second quarter	$	122.50	$	111.93	$	0.66	$	105.89	$	97.21	$	0.66
Third quarter	$	123.71	$	109.55	$	0.70	$	109.69	$	100.10	$	0.66
Fourth quarter	$	128.12	$	116.38	$	0.70	$	110.98	$	98.67	$	0.66

Performance Graph - Unaudited (Tables)

12 Months Ended

Dec. 31, 2017

Performance Graph [Abstract]

Cumulative Total Shareholder Return [Table Text Block]

COMPARISON OF CUMULATIVE FIVE YEAR TOTAL RETURN



	December
	2012		2013		2014		2015		2016		2017
United Technologies Corporation	$	100.00	$	141.87	$	146.39	$	125.30	$	146.66	$	174.62
S&P 500 Index	$	100.00	$	132.39	$	150.51	$	152.59	$	170.84	$	208.14
Dow Jones Industrial Average	$	100.00	$	129.65	$	142.67	$	142.98	$	166.56	$	213.38

Summary of Accounting Principles (Details) € in Millions, $ in Millions	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounting Policies [Abstract]
Restricted Cash And Cash Equivalents	$ 33		$ 32	$ 45
Unbilled Contracts Receivable	2,770		2,786
Contract Receivable Retainage	118		106
Excess Of Replacement Or Current Costs Over Stated LIFO Value	106		114
Hedging Liabilities, Noncurrent \| €		€ 3,700
Commercial Aerospace [Member]
Accounting Policies [Abstract]
Unbilled Contracts Receivable	$ 1,109		$ 1,169

Summary of Accounting Principles Summary of Accounting Principles (Marketable Securities) (Details) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unrealized gains on available for sale securities	$ 5
ASU 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU modifies how entities measure equity investments and present changes in the fair value of financial liabilities. Upon adoption, investments that do not result in consolidation and are not accounted for under the equity method generally must be carried at fair value, with changes in fair value recognized in net income. As discussed in Note 10, we have approximately $5 million of unrealized gains on these securities recorded in Accumulated other comprehensive loss in our Consolidated Balance Sheet as of December 31, 2017. We adopted this standard effective January 1, 2018, with these amounts recorded directly to retained earnings as of that date.

- Definition

Disclosure related to a new accounting pronouncement or a change in accounting principle, including the nature and reason for the change and the effect of the change on prior periods and the current period.

+ References + Details

Summary of Accounting Principles (Indefinite Lived Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2017
Collaboration Asset [Member] \| Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	30 years
Customer Relationships and Related Programs [Member] \| Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Customer Relationships and Related Programs [Member] \| Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	50 years
Purchased Service Contracts [Member] \| Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Purchased Service Contracts [Member] \| Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	25 years
Patents & trademarks [Member] \| Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Patents & trademarks [Member] \| Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	40 years
Exclusivity Assets [Member] \| Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Exclusivity Assets [Member] \| Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	25 years

Summary of Accounting Principles (Long-Term Receivables) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total Long Term Receivable	$ 1,397	$ 1,356
Percentage Long Term Receivables High Credit Risk	11.00%	13.00%
Financing Receivable, Reserve for Credit Losses and Exposure, Individually Evaluated For Impairment	$ 17	$ 17
Long-term Trade Accounts Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Long Term Receivable	973	926
Notes and Leases Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Long Term Receivable	$ 424	$ 430

Summary of Accounting Principles (Revenue Recognition) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (Decrease) in Operating Profit Due to Contract Reestimates	$ (110)	$ (157)	$ 115
Inventory Costs in Excess of Average Cost Per Unit	$ 438	$ 233
ASU 2015-14 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date - delays the effective date of ASU 2014-09 by one year.
ASU 2016-08 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	ASU 2016-08, Revenue from Contracts with Customers (Topic 606), Principal versus Agent Considerations (Reporting Revenue Gross versus Net) - clarifies how an entity should identify the unit of accounting (i.e. the specified good or service) for the principal versus agent evaluation and how it should apply the control principle to certain types of arrangements.
ASU 2016-10 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	ASU 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing - clarifies the guidance surrounding licensing arrangements and the identification of performance obligations.
ASU 2016-12 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	ASU 2016-12, Revenue from Contracts with Customers (Topic 606), Narrow-Scope Improvements and Practical Expedients - addresses implementation issues raised by stakeholders concerning collectability, noncash consideration, presentation of sales tax, and transition.
ASU 2016-20 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	ASU 2016-20, Revenue from Contracts with Customers (Topic 606), Technical Corrections and Improvements - addresses loan guarantee fees, impairment testing of contract costs, provisions for losses on certain contracts, and various disclosures.
ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	ASU 2014-09 and its related amendments (collectively, the New Revenue Standard) are effective for reporting periods beginning after December 15, 2017, and interim periods therein. In accordance with the standard, we have adopted the New Revenue Standard effective January 1, 2018 and elected the modified retrospective approach with the cumulative effect of adoption recognized through retained earnings at the date of adoption. The New Revenue Standard will change the revenue recognition practices for a number of revenue streams across our businesses, although the most significant impacts will be concentrated within our aerospace units. Several businesses, which currently account for revenue on an output units of delivery basis will be required to use an input method of an “over time” model as they meet one or more of the mandatory criteria established in the New Revenue Standard. Revenue will now be recognized based on percentage-of-completion for repair contracts within Otis and UTC Climate, Controls & Security; certain U.S. Government aerospace contracts; and aerospace aftermarket service work. For these businesses, unrecognized sales and operating profits related to the satisfied portion of the performance obligations of contracts in process as of the date of adoption will be recorded through retained earnings. While we are still finalizing our retained earnings impact evaluation, the ongoing effect of recognizing revenue on an input method of an over time model within these businesses is not expected to be material. In addition to the foregoing, our aerospace businesses will also incur changes related to the timing of manufacturing cost recognition and certain engineering and development costs. In most circumstances, our commercial aerospace businesses will identify the performance obligation, or the unit of accounting, as the individual original equipment (OEM) unit; revenues and costs to manufacture each unit will be recognized upon OEM unit delivery. Generally under current practice, the unit of accounting is the contract, and early-contract OEM unit costs in excess of the average expected over the contact are capitalized and amortized over lower-cost units later in the contract. With the adoption of the New Revenue Standard, deferred unit costs in excess of the contract average of $438 million as of December 31, 2017 will be eliminated through retained earnings and will not be amortized into future earnings. With regard to costs incurred for the engineering and development of aerospace products under contract with customers, we generally expense as incurred unless there is a contractually guaranteed right of recovery. The New Revenue Standard requires product engineering and development costs to be capitalized as contract fulfillment costs, to the extent recoverable from the associated contract margin, and subsequently amortized as the OEM products are delivered to the customer. We are still finalizing the calculation of the impact of this change to our adoption-date retained earnings. The ongoing impact will not change the total amount of cost incurred, but will change the timing of recognition of that cost. Prior to the New Revenue Standard, any customer funding received for such development efforts was recognized when earned, with the corresponding costs recognized as cost of sales. The New Revenue Standard requires customer funding of OEM product engineering and development to be deferred and recognized as revenue as the OEM products are delivered to the customer. For contracts that are open as of the adoption date, previously recognized customer funding will be established as a contract liability as deferred income. We are still finalizing the calculation of the impact of this change to our adoption-date retained earnings. We expect the New Revenue Standard will have an immaterial impact on our 2018 net income. Adoption of the New Revenue Standard will result in income statement classification changes between Revenues, Cost of sales, Research & development, and Other Income. The New Revenue standard will also result in the establishment of Contract Asset and Contract Liability balance sheet accounts, and in the reclassification to these new accounts from Accounts receivable; Inventories and contracts in progress, net; and Accrued liabilities. The New Revenue Standard requires ongoing incremental disclosures including explanation of significant changes in the Contract Asset and Contract Liability balances, and disaggregation of revenue into categories that depict how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. The New Revenue Standard also requires disclosure of remaining performance obligations, which is a concept that is similar to that of backlog, which we report in Item I, Part I of our Form 10-K. Beginning in 2018, we will align our definition of backlog with that of remaining performance obligations under the New Revenue Standard. We have historically included in backlog engine orders from airlines for which such purchase orders have not yet been received. Effective with the adoption of the New Revenue Standard, we will no longer include in backlog airline engine orders for which we have not yet received the associated firm manufacturing purchase order. Excluding these engine orders is expected to result in a significant decline in reported backlog in 2018.

Summary of Accounting Principles (Collaborative Arrangements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborators interests existing programs low end	14.00%
Collaborators interests existing programs high end	50.00%
Partner share individual program maximum	31.00%
Cost of Products Sold [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborator Share Of Sales	$ 1,789	$ 1,700	$ 1,547
Collaborator Share Of Program Costs	143	108	104
Cost of Services Sold [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborator Share Of Sales	929	675	652
Research and Development [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborator Share Of Program Costs	190	184	248
Selling General and Administrative [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborator Share Of Program Costs	$ 74	$ 57	$ 53

Summary of Accounting Principles Accounting Pronouncements (Details)	12 Months Ended
	Dec. 31, 2017
ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	Costs accumulated against specific contracts or orders are at actual cost. Valuation reserves for excess, obsolete, and slow-moving inventory are estimated by comparing the inventory levels of individual parts to both future sales forecasts or production requirements and historical usage rates in order to identify inventory where the resale value or replacement value is less than inventoriable cost. Other factors that management considers in determining the adequacy of these reserves include whether individual inventory parts meet current specifications and cannot be substituted for a part currently being sold or used as a service part, overall market conditions, and other inventory management initiatives. Manufacturing costs are allocated to current production and firm contracts. Within commercial aerospace, inventory costs attributable to new engine offerings are recognized based on the average cost per unit expected over the life of each contract using the units-of-delivery method of percentage of completion accounting. Under this method, costs of initial engine deliveries in excess of the projected contract per unit average cost are capitalized, and these capitalized amounts are subsequently expensed as additional engine deliveries occur for engines with costs below the projected contract per unit average cost over the life of the contract. As described in the "Revenue Recognition" section of Note 1 below, these costs will be eliminated through retained earnings and will not be amortized into future earnings upon adoption of Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers effective January 1, 2018.
ASU 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	In March 2017, the FASB issued ASU 2017-07, Compensation—Retirement Benefits (Topic 715), Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This ASU requires an employer to report the service cost component of net periodic pension benefit cost in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period, with other cost components presented separately from the service cost component and outside of income from operations. This ASU also allows only the service cost component of net periodic pension benefit cost to be eligible for capitalization when applicable. The provisions of this ASU are effective for years beginning after December 15, 2017, and we adopted the new standard effective January 1, 2018. Provisions related to presentation of the service cost components versus other cost components must be applied retrospectively, while provisions related to service cost component eligibility for capitalization must be applied prospectively. This ASU primarily impacts the presentation of net periodic pension cost/benefit and therefore we do not expect this ASU to have a material impact on net income; however, it will result in changes to reported operating profit.
ASU 2016-16 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. This ASU requires the income tax consequences of an intra-entity transfer of an asset, other than inventory, to be recognized when the transfer occurs. Two common examples of assets included in the scope of this update are intellectual property and property, plant, and equipment. The provisions of this ASU are effective for years beginning after December 15, 2017, with early adoption permitted. We do not expect this ASU to have a significant impact on our financial statements or disclosures. We adopted the new standard effective January 1, 2018.
ASU 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	In February 2016, the FASB issued ASU 2016- 02, Leases (Topic 842). The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the Consolidated Statement of Operations. In addition, this standard requires a lessor to classify leases as either sales-type, finance or operating. A lease will be treated as a sale if it transfers all of the risks and rewards, as well as control of the underlying asset, to the lessee. If risks and rewards are conveyed without the transfer of control, the lease is treated as financing. If the lessor doesn’t convey risks and rewards or control, the lease is treated as operating. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for lessees for capital and operating leases and lessors for sales-type, direct financing, and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. In November 2017, the FASB announced a decision to offer an additional practical expedient related to the transition to the new lease accounting standard which allows for its prospective adoption. The FASB is expected to formally communicate this new practical expedient through an Accounting Standards Update to be released in early 2018. While we are still evaluating the impact of our pending adoption of the new standard on our consolidated financial statements, we expect that upon adoption we will recognize ROU assets and lease liabilities and that the amounts could be material. We do not expect the ASU to have a material impact on our cash flows or results of operations.
ASU 2017-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. This ASU provides a new framework that will assist in the evaluation of whether business combination transactions should be accounted for as an acquisition of a business or as a group of assets, and specifies the minimum required inputs and processes necessary to be a business. The provisions of this ASU are effective for years beginning after December 15, 2017, with early adoption permitted. We adopted the new standard effective January 1, 2018.
ASU 2017-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU provides that an entity should account for the effects of a modification unless the fair value, the vesting conditions of the modified award and the classification of the modified award (equity or liability instrument) are the same as the original award immediately before the modification. The provisions of this ASU are effective for years beginning after December 15, 2017, with early adoption permitted. We do not expect this ASU to have a significant impact on our financial statements or disclosures. We adopted the new standard effective January 1, 2018.
ASU 2017-12 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This ASU will make more financial and nonfinancial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. It is intended to more closely align hedge accounting with a company’s risk management strategies, simplify the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. The provisions of this ASU are effective for years beginning after December 15, 2018, with early adoption permitted for any interim period after issuance of the ASU. We do not expect this ASU to have a significant impact on our results of operations or financial position. We adopted the new standard effective January 1, 2018.
ASU 2017-04 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 of the current goodwill impairment test, which requires a hypothetical purchase price allocation to measure goodwill impairment. A goodwill impairment loss will instead be measured at the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the recorded amount of goodwill. The provisions of this ASU are effective for years beginning after December 15, 2019, with early adoption permitted for any impairment test performed on testing dates after January 1, 2017. We early adopted this standard as of July 1, 2017 and this ASU did not have a significant impact on our financial statements or disclosures.

Business Acquisitions, Dispositions, Goodwill and Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 04, 2017
Business Acquisition [Line Items]
Acquisition Cost Of Acquired Entities and Interest in Affiliates	$ 231,000,000	$ 712,000,000	$ 556,000,000
Noncash Or Part Noncash Acquisition Debt Assumed		$ 2,000,000	18,000,000
Unsecured bridge loan credit agreement				$ 6,500,000,000
Rockwell Collins [Member]
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement	Sep. 04, 2017
Business Acquisition, Name of Acquired Entity	Rockwell Collins, Inc. (Rockwell Collins)
Business Acquisition Cash Paid	$ 93.33
Business Acquisition UTC stock payable	46.67
Payments to Acquire Businesses, Gross	15,000,000,000
Unsecured bridge loan credit agreement	6,500,000,000
Business Acquisition, Assumed Long-term Debt	$ 7,000,000,000
Sikorsky [Member]
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses			$ 9,100,000,000

Business Acquisitions, Dispositions, Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 27,910	$ 27,059
Goodwill resulting from business combinations	158
Goodwill, foreign currency translation and other	693
Otis [Member]
Goodwill [Line Items]
Goodwill	1,737	1,575
Goodwill resulting from business combinations	28
Goodwill, foreign currency translation and other	134
UTC Climate, Controls and Security [Member]
Goodwill [Line Items]
Goodwill	10,009	9,487
Goodwill resulting from business combinations	130
Goodwill, foreign currency translation and other	392
Pratt and Whitney [Member]
Goodwill [Line Items]
Goodwill	1,511	1,511
Goodwill resulting from business combinations	0
Goodwill, foreign currency translation and other	0
UTC Aerospace Systems [Member]
Goodwill [Line Items]
Goodwill	14,650	14,483
Goodwill resulting from business combinations	0
Goodwill, foreign currency translation and other	167
Eliminations and other [Member]
Goodwill [Line Items]
Goodwill	3	3
Goodwill resulting from business combinations	0
Goodwill, foreign currency translation and other	0
Total Segments [Member]
Goodwill [Line Items]
Goodwill	27,907	$ 27,056
Goodwill resulting from business combinations	158
Goodwill, foreign currency translation and other	$ 693

Business Acquisitions, Dispositions, Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Trademarks and other	$ 2,096	$ 2,025
Total	22,134	20,920
Finite-Lived Intangible Assets [Line Items]
Gross Amount	20,038	18,895
Accumulated Amortization	6,251	5,236
Service Portfolios [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	2,178	1,995
Accumulated Amortization	1,534	1,344
Patents and trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	399	378
Accumulated Amortization	233	201
Collaboration [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	4,109	3,724
Accumulated Amortization	384	211
Customer Relationships and Other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	13,352	12,798
Accumulated Amortization	$ 4,100	$ 3,480

Business Acquisitions, Dispositions, Goodwill and Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization Expense, Year 1	$ 902
Amortization Expense, Year 2	869
Amortization Expense, Year 3	888
Amortization Expense, Year 4	902
Amortization Expense, Year 5	895
Amortization of Intangible Assets	$ 834	$ 778	$ 722

Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement by Disposal Groups, Including Discontinued Operations [Line Items]
Gain from Divestiture of Business	$ 0	$ 13	$ 6,042
Income tax expense		24	2,684
Net cash flows (used in) provided by discontinued operations	$ 0	(2,526)	$ 8,619
Sikorsky [Member]
Income Statement by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Date			Nov. 06, 2015
Proceeds from Divestiture of Businesses			$ 9,100
Gain from Divestiture of Business		13
Income tax expense		24
Net cash flows (used in) provided by discontinued operations		$ 2,500
Net sales to Sikorsky			138
Purchases from Sikorsky, cost of products and services sold			$ 25

- Definition

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

+ References + Details

Discontinued Operations (Income Statement Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Net (loss) income from discontinued operations	$ 0	$ (10)	$ 3,610

- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share amount									5,900,000	14,500,000	9,700,000
Net Income (Loss) Attributable to Common Shareowners
Net income from continuing operations									$ 4,552	$ 5,065	$ 3,996
Net (loss) income from discontinued operations									0	(10)	3,612
Net income attributable to common shareowners	$ 397	$ 1,330	$ 1,439	$ 1,386	$ 1,013	$ 1,480	$ 1,379	$ 1,183	$ 4,552	$ 5,055	$ 7,608
Basic weighted average number of shares outstanding									790,000,000	818,200,000.0	872,700,000.0
Stock Awards									9,100,000	7,900,000	10,500,000
Diluted weighted average number of shares outstanding									799,100,000	826,100,000	883,200,000
Earnings Per Share of Common Stock - Basic
Net income from continuing operations									$ 5.76	$ 6.19	$ 4.58
Net (loss) income from discontinued operations									0.00	(0.01)	4.14
Net income attributable to common shareowners	$ 0.50	$ 1.69	$ 1.83	$ 1.75	$ 1.26	$ 1.80	$ 1.67	$ 1.43	5.76	6.18	8.72
Earnings Per Share of Common Stock - Diluted
Net income from continuing operations									5.70	6.13	4.53
Net (loss) income from discontinued operations									0.00	(0.01)	4.09
Net income attributable to common shareowners	$ 0.50	$ 1.67	$ 1.80	$ 1.73	$ 1.25	$ 1.78	$ 1.65	$ 1.42	$ 5.70	$ 6.12	$ 8.61

Commercial Aerospace Industry Assets and Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Unbilled Contracts Receivable	$ 2,770	$ 2,786
Commercial Aerospace [Member]
Accounts Notes And Loans Receivable [Line Items]
Guarantee Obligations Maximum Exposure	336	348
Commercial Aerospace [Member]
Accounts Notes And Loans Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable, gross	9,477	7,222
Products Under Lease	1,913	939
Notes and leases receivable, total committed	652	497
Commercial Aerospace financing and other contractual commitments	15,300
Notes and leases receivable within one year	211
Notes and leases receivable within two years	56
Notes and leases receivable within three years	79
Notes and leases receivable within four years	38
Notes and leases receivable within five years	35
Notes and leases receivable after five years	233
Commercial aerospace financing commitments, total committed	4,012
Commercial aerospace financing commitments within one year	371
Commercial aerospace financing commitments within two years	678
Commercial aerospace financing commitments within three years	636
Commercial aerospace financing commitments within four years	891
Commercial aerospace financing commitments within five years	783
Commercial aerospace financing commitments after five years	653
Other commercial aerospace commitments, total committed	11,270
Other commercial aerospace commitments within one year	910
Other commercial aerospace commitments within two years	840
Other commercial aerospace commitments within three years	684
Other commercial aerospace commitments within four years	735
Other commercial aerospace commitments within five years	645
Other commercial aerospace commitments after five years	7,456
Collaboration partners' share, total committed	5,109
Collaboration partners' share within one year	374
Collaboration partners' share within two years	402
Collaboration partners' share within three years	396
Collaboration partners' share within four years	525
Collaboration partners' share within five years	491
Collaboration partners' share after five years	2,921
Total commercial commitments, total committed	10,173
Total commercial commitments within one year	907
Total commercial commitments within two years	1,116
Total commercial commitments within three years	924
Total commercial commitments within four years	1,101
Total commercial commitments within five years	937
Total commercial commitments after five years	5,188
Unbilled Contracts Receivable	1,109	1,169
Deferred Revenue	5,048	4,288
Allowance for Receivables and Other Financing Assets	175	173
Financing Commitments and Guarantees Reserve	23	36
Goodrich Corporation [Member]
Accounts Notes And Loans Receivable [Line Items]
Contractual Obligation	986
Contractual Obligation, Consumed in Current Year	217	$ 213
Contractual Obligation, Due in Next Fiscal Year	257
Contractual Obligation, Due in Second Year	229
Contractual Obligation, Due in Third Year	150
Contractual Obligation, Due in Fourth Year	84
Contractual Obligation, Due in Fifth Year	37
Contractual Obligation, Due after Fifth Year	$ 229

Inventories and Contracts in Progress (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Inventory Costs in Excess of Average Cost Per Unit	$ 438	$ 233
Raw materials	2,038	2,040
Work-in-process	3,366	2,787
Finished goods	3,845	3,305
Contracts in progress	10,205	9,395
Inventories before payments and billings	19,454	17,527
Progress payments, secured by lien, on U.S. Government contracts	236	130
Billings on contracts in progress	9,337	8,693
Inventories and contracts in progress, net	9,881	8,704
Inventory Valuation Reserves	$ 1,107	$ 877
Percentage Of Inventory For Long Term Contracts Or Programs	63.00%	68.00%
Percentage Of Inventory For Long Term Contracts Scheduled For Delivery Within Succeeding 12 Months	38.00%	41.00%
UTC Aerospace Systems [Member]
Inventory [Line Items]
Capitalized Contract Development Costs	$ 127	$ 140

Fixed Assets (Details) - USD ($) $ in Millions	12 Months Ended
Fixed Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Land	$ 412	$ 392
Buildings and improvements	5,727	5,180
Machinery, tools and equipment	13,476	12,471
Other, including assets under construction	1,749	1,426
Fixed assets	21,364	19,469
Accumulated depreciation	11,178	10,311
Fixed assets, net	10,186	9,158
Property Plant And Equipment [Line Items]
Depreciation	$ 1,178	$ 1,105	$ 1,068
Land Buildings And Improvements [Member] \| Maximum [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Land Buildings And Improvements [Member] \| Minimum [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	12 years
Machinery And Equipment [Member] \| Maximum [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Machinery And Equipment [Member] \| Minimum [Member]
Property Plant And Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years

Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities [Abstract]
Advances on sales contracts and service billings	$ 4,547	$ 4,217
Accrued salaries, wages and employee benefits	1,741	1,608
Service and warranty accruals	629	555
Interest payable	439	395
Litigation and contract matters	435	488
Income taxes payable	285	382
Accrued property, sales and use taxes	258	289
Canadian government settlement - current portion	217	245
Accrued restructuring costs	212	210
Accrued workers compensation	204	208
Other	3,349	3,622
Accrued liabilities	$ 12,316	$ 12,219

Accrued Liabilities Narrative (Details) $ in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD ($)	Dec. 31, 2016 USD ($)
Accrued Liabilities [Abstract]
Candadian Government Amendment Arrangements, Annual Payment Amount		$ 256	$ 327
Canadian Government Amendment Arrangements, Expense	$ 867
Canadian Government Amendment Arrangements, Remaining Liability		$ 256		$ 477

Borrowings and Lines of Credit (Short-Term Borrowings) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Commercial Paper	$ 300	$ 522
Other borrowings	92	79
Total short-term borrowings	$ 392	$ 601

Borrowings and Lines of Credit (ST Borrowings Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Sep. 04, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Maximum Commercial Paper Borrowing Authority	$ 4,350
Short Term Line of Credit Facilities Remaining Borrowing Capacities	$ 1,300
Short Term Debt Weighted Average Interest Rate, Avg Outstanding	1.10%		1.30%
Total Debt Weighted Average Interest Rate, Avg Outstanding	3.50%		4.10%
Short Term Debt Weighted Average Interest Rate, Outstanding	2.276%		0.60%
Total Debt Weighted Average Interest Rate, Outstanding	3.50%		3.70%
Line of Credit Facility [Line Items]
Aggregate Line of Credit Facility Maximum Borrowing Capacity	$ 4,350
Unsecured bridge loan credit agreement		$ 6,500
Multicurrency Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Aug. 05, 2021
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,150
Long-term Line of Credit	$ 0
Revolving Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Aug. 05, 2021
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,200
Long-term Line of Credit	$ 0

Borrowings and Lines of Credit (Long-Term Debt) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Debt Instrument [Line Items]

Project financing obligations

$ 158

$ 155

Total principal long-term debt

27,118

23,299

Other debt (including capitalized leases)

195

189

Other (fair market value adjustments, discounts and debt issuance costs)

(25)

Total long-term debt

27,093

23,300

Less: current portion

2,104

1,603

Long-term debt, net of current portion

24,989

21,697

Long Term Debt Maturities Repayments Of Principal In Next Twelve Months

2,104

Long Term Debt Maturities Repayments Of Principal In Year Two

2,271

Long Term Debt Maturities Repayments Of Principal In Year Three

2,479

Long Term Debt Maturities Repayments Of Principal In Year Four

2,175

Long Term Debt Maturities Repayments Of Principal In Year Five

2,804

Long Term Debt Maturities Repayments Of Principal After Year Five

15,285

Notes 1.800% Due 2017 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 0

1,500

Debt Instrument, Interest Rate, Stated Percentage

1.80%

Debt Instrument, Maturity Year Date

2017

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 6.800% Due 2018 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

$ 99

Debt Instrument, Interest Rate, Stated Percentage

6.80%

Debt Instrument, Maturity Year Date

2018

EURIBOR plus 0.800% floating rate notes due 2018 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[2]

$ 890

783

Debt Instrument, Maturity Year Date

2018

Debt Instrument, Call Feature

The three-month EURIBOR rate as of December 30, 2017 was approximately -0.329%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.

Junior subordinated notes 1.778% due 2018 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

$ 1,100

1,100

Debt Instrument, Interest Rate, Stated Percentage

1.778%

Debt Instrument, Maturity Year Date

2018

LIBOR plus 0.350% floating rate notes due 2019

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[3]

$ 350

350

Debt Instrument, Maturity Year Date

2019

Debt Instrument, Call Feature

The three-month LIBOR rate as of December 30, 2017 was approximately 1.694%.

Notes 1.500% Due 2019 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 650

650

Debt Instrument, Interest Rate, Stated Percentage

1.50%

Debt Instrument, Maturity Year Date

2019

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

EURIBOR plus 0.15% floating rate notes due 2019 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 890

Debt Instrument, Maturity Year Date

2019

Debt Instrument, Call Feature

The three-month EURIBOR rate as of December 30, 2017 was approximately -0.329%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments

Notes 8.875% Due 2019 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

$ 271

271

Debt Instrument, Interest Rate, Stated Percentage

8.875%

Debt Instrument, Maturity Year Date

2019

Notes 4.875% Due 2020 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 171

171

Debt Instrument, Interest Rate, Stated Percentage

4.875%

Debt Instrument, Maturity Year Date

2020

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 4.500% Due 2020 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 1,250

1,250

Debt Instrument, Interest Rate, Stated Percentage

4.50%

Debt Instrument, Maturity Year Date

2020

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 1.900% Due 2020 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 1,000

Debt Instrument, Interest Rate, Stated Percentage

1.90%

Debt Instrument, Maturity Year Date

2020

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 8.750% Due 2021 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

$ 250

250

Debt Instrument, Interest Rate, Stated Percentage

8.75%

Debt Instrument, Maturity Year Date

2021

Notes 1.950% Due 2021 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 750

750

Debt Instrument, Interest Rate, Stated Percentage

1.95%

Debt Instrument, Maturity Year Date

2021

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 1.125% Due 2021 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 1,127

992

Debt Instrument, Interest Rate, Stated Percentage

1.125%

Debt Instrument, Maturity Year Date

2021

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 2.300% Due 2022 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 500

Debt Instrument, Interest Rate, Stated Percentage

2.30%

Debt Instrument, Maturity Year Date

2022

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 3.100% Due 2022 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 2,300

2,300

Debt Instrument, Interest Rate, Stated Percentage

3.10%

Debt Instrument, Maturity Year Date

2022

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 1.250% due 2023 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 890

783

Debt Instrument, Interest Rate, Stated Percentage

1.25%

Debt Instrument, Maturity Year Date

2023

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 2.800% Due 2024 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 800

Debt Instrument, Interest Rate, Stated Percentage

2.80%

Debt Instrument, Maturity Year Date

2024

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 1.875% Due 2026 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 593

522

Debt Instrument, Interest Rate, Stated Percentage

1.875%

Debt Instrument, Maturity Year Date

2026

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 2.650% Due 2026 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 1,150

1,150

Debt Instrument, Interest Rate, Stated Percentage

2.65%

Debt Instrument, Maturity Year Date

2026

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 3.125% Due 2027 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 1,100

Debt Instrument, Interest Rate, Stated Percentage

3.125%

Debt Instrument, Maturity Year Date

2027

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 7.100% Due 2027 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

$ 141

141

Debt Instrument, Interest Rate, Stated Percentage

7.10%

Debt Instrument, Maturity Year Date

2027

Notes 6.700% Due 2028 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

$ 400

400

Debt Instrument, Interest Rate, Stated Percentage

6.70%

Debt Instrument, Maturity Year Date

2028

Notes 7.500% Due 2029 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 550

550

Debt Instrument, Interest Rate, Stated Percentage

7.50%

Debt Instrument, Maturity Year Date

2029

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 5.400% Due 2035 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 600

600

Debt Instrument, Interest Rate, Stated Percentage

5.40%

Debt Instrument, Maturity Year Date

2035

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 6.050% Due 2036 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 600

600

Debt Instrument, Interest Rate, Stated Percentage

6.05%

Debt Instrument, Maturity Year Date

2036

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 6.800% Due 2036 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 134

134

Debt Instrument, Interest Rate, Stated Percentage

6.80%

Debt Instrument, Maturity Year Date

2036

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 7.000% Due 2038 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

$ 159

159

Debt Instrument, Interest Rate, Stated Percentage

7.00%

Debt Instrument, Maturity Year Date

2038

Notes 6.125% Due 2038 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 1,000

1,000

Debt Instrument, Interest Rate, Stated Percentage

6.125%

Debt Instrument, Maturity Year Date

2038

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 5.700% Due 2040 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 1,000

1,000

Debt Instrument, Interest Rate, Stated Percentage

5.70%

Debt Instrument, Maturity Year Date

2040

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 4.500% Due 2042 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 3,500

3,500

Debt Instrument, Interest Rate, Stated Percentage

4.50%

Debt Instrument, Maturity Year Date

2042

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 4.150% Due 2045 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 850

850

Debt Instrument, Interest Rate, Stated Percentage

4.15%

Debt Instrument, Maturity Year Date

2045

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 3.750% Due 2046 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 1,100

1,100

Debt Instrument, Interest Rate, Stated Percentage

3.75%

Debt Instrument, Maturity Year Date

2046

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

Notes 4.050% Due 2047 [Member]

Debt Instrument [Line Items]

Debt Instrument, Carrying Amount

^[1]

$ 600

$ 0

Debt Instrument, Interest Rate, Stated Percentage

4.05%

Debt Instrument, Maturity Year Date

2047

Debt Instrument, Call Feature

We may redeem these notes at our option pursuant to their terms.

[1]	We may redeem these notes at our option pursuant to their terms.
[2]	The three-month EURIBOR rate as of December 29, 2017 was approximately -0.329%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.
[3]	The three-month LIBOR rate as of December 29, 2017 was approximately 1.694%.

Borrowings and Lines of Credit Borrowings and Lines of Credit (LT Debt Narrative) (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Percentage Bearing Variable Interest Rate	9.00%	9.00%	7.00%
Gain (Loss) on Extinguishment of Debt	$ 164
Average Years of Maturity of Long Term Debt	11 years	11 years
LIBOR plus 0.350% floating rate notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Nov. 01, 2016	Nov. 01, 2016
Proceeds from Issuance of Debt	$ 350
Debt Instrument, Maturity Year Date	2019	2019
EURIBOR plus 0.15% floating rate notes due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Nov. 13, 2017	Nov. 13, 2017
Proceeds from Issuance of Debt \| €		€ 750
Debt Instrument, Maturity Year Date	2019	2019
EURIBOR plus 0.800% floating rate notes due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Feb. 22, 2016	Feb. 22, 2016
Proceeds from Issuance of Debt \| €		€ 750
Debt Instrument, Maturity Year Date	2018	2018
Notes 1.125% Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Feb. 22, 2016	Feb. 22, 2016
Proceeds from Issuance of Debt \| €		€ 950
Debt Instrument, Maturity Year Date	2021	2021
Notes 1.875% Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Feb. 22, 2016	Feb. 22, 2016
Proceeds from Issuance of Debt \| €		€ 500
Debt Instrument, Maturity Year Date	2026	2026
Notes 2.300% Due 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	May 04, 2017	May 04, 2017
Proceeds from Issuance of Debt	$ 500
Debt Instrument, Maturity Year Date	2022	2022
Notes 1.900% Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	May 04, 2017	May 04, 2017
Proceeds from Issuance of Debt	$ 1,000
Debt Instrument, Maturity Year Date	2020	2020
Notes 2.800% Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	May 04, 2017	May 04, 2017
Proceeds from Issuance of Debt	$ 800
Debt Instrument, Maturity Year Date	2024	2024
Notes 3.125% Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	May 04, 2017	May 04, 2017
Proceeds from Issuance of Debt	$ 1,100
Debt Instrument, Maturity Year Date	2027	2027
Notes 4.050% Due 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	May 04, 2017	May 04, 2017
Proceeds from Issuance of Debt	$ 600
Debt Instrument, Maturity Year Date	2047	2047
Notes 1.500% Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Nov. 01, 2016	Nov. 01, 2016
Proceeds from Issuance of Debt	$ 650
Debt Instrument, Maturity Year Date	2019	2019
Notes 1.950% Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Nov. 01, 2016	Nov. 01, 2016
Proceeds from Issuance of Debt	$ 750
Debt Instrument, Maturity Year Date	2021	2021
Notes 2.650% Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Nov. 01, 2016	Nov. 01, 2016
Proceeds from Issuance of Debt	$ 1,150
Debt Instrument, Maturity Year Date	2026	2026
Notes 3.750% Due 2046 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Nov. 01, 2016	Nov. 01, 2016
Proceeds from Issuance of Debt	$ 1,100
Debt Instrument, Maturity Year Date	2046	2046
Notes 5.375% Due 2017 [Member]
Debt Instrument [Line Items]
Repayment of Debt, Date	Dec. 01, 2016	Dec. 01, 2016
Repayments of Debt	$ 1,000
Notes 6.125% Due 2019 [Member]
Debt Instrument [Line Items]
Repayment of Debt, Date	Dec. 01, 2016	Dec. 01, 2016
Repayments of Debt	$ 1,250

Equity (Accelerated Share Repurchase) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accelerated Share Repurchases [Line Items]
Stock Repurchased During Period, Shares	12.9	32.3	88.7
Stock Issued During Period, Value, Other			$ 1,100
Stock Issued During Period, Shares, Other			11.3
November 11, 2015 ASR [Member]
Accelerated Share Repurchases [Line Items]
ASR Aggregate Purchase Price			$ 6,000
Accelerated Share Repurchases, Cash or Stock Settlement	On November 11, 2015, we entered into ASR agreements to repurchase an aggregate of $6 billion of our common stock utilizing the net after-tax proceeds from the sale of Sikorsky. Under the terms of the ASR agreements, we made the aggregate payments and received an initial delivery of approximately 51.9 million shares of our common stock, representing approximately 85% of the shares expected to be repurchased. In 2016, the shares associated with the remaining portion of the aggregate purchase were settled upon final delivery to us of approximately 10.1 million additional shares of common stock. Including the remaining shares associated with the six tranches settled in 2016, the final price under the November 11, 2015 ASR was $96.74 per share.
Stock Repurchased During Period, Shares		10.1	51.9
Accelerated Share Repurchases, Final Price Paid Per Share			$ 96.74
March 13, 2015 ASR [Member]
Accelerated Share Repurchases [Line Items]
ASR Aggregate Purchase Price			$ 2,650
Accelerated Share Repurchases, Cash or Stock Settlement	On March 13, 2015, we entered into ASR agreements to repurchase an aggregate of $2.65 billion of our common stock. Under the terms of the ASR agreements, we made the aggregate payments and received an initial delivery of approximately 18.6 million shares of our common stock, representing approximately 85% of the shares expected to be repurchased. On July 31, 2015, the shares associated with the remaining portion of the aggregate purchase were settled upon final delivery of approximately 4.2 million additional shares of common stock. Including the remaining shares settled on July 31, 2015, the final price under the ASR was $116.11 per share.
Stock Repurchased During Period, Shares			18.6
July 31, 2015 settlement of ASR [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchased During Period, Shares			4.2
Accelerated Share Repurchases, Final Price Paid Per Share			$ 116.11
August 3, 2015 debt remarketing [Member]
Accelerated Share Repurchases [Line Items]
Long Term Debt Remarketing, Proceeds			$ 1,100
Long Term Debt Remarketing, Number of Shares Issued			11.3

Equity (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (7,525)	$ (8,334)	$ (7,619)
Other comprehensive (loss) income, net - Foreign Currency Translation	620	(1,089)	(1,502)
Amounts reclassified, pretax - Foreign Currency Translation	10	0	(42)
Tax reclassified - Foreign Currency Translation	0	0
Other comprehensive (loss) income before reclassifications, net - Pension	(78)	247
Amounts reclassified, pretax - Pension	529	535	867
Tax reclassified - Pension	214	198
Other comprehensive (loss) income before reclassifications, net - AFS Securities	3	119
Amounts reclassified, pretax - AFS Securities	566	94	54
Tax reclassified - AFS Securities	215	35
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains	264	54
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains	39	(171)	(234)
Tax reclassified - Unrealized Hedging (Losses) Gains	9	(48)
Other comprehensive (loss) income before reclassifications, net	885	(1,116)
Amounts reclassified, pretax	86	(612)
Tax reclassified	10	(211)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,950)	(3,480)	(2,438)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,652)	(5,045)	(5,135)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	5	353	293
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	72	(162)	$ (339)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income, net - Foreign Currency Translation	540	$ (1,042)
Sale of investments in Watsco, Inc. [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified, pretax - AFS Securities	$ 500

Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Income, United States	$ 2,990	$ 2,534	$ 2,782
Income, Foreign	4,773	4,599	3,685
Income from continuing operations before income taxes	7,763	7,133	6,467
Undistributed Earnings of Foreign Subsidiaries	34,000
Current Tax Provision, Federal	1,577	30	328
Current Tax Provision, State	64	(21)	(37)
Current Tax Provision, Foreign	1,140	1,290	1,158
Current Income Tax Expense Benefit	2,781	1,299	1,449
Future Tax Provision, Federal	(27)	318	712
Future Tax Provision, State	84	134	109
Future Tax Provision, Foreign	5	(54)	(159)
Deferred income tax provision	62	398	662
Income tax expense	2,843	1,697	2,111
Attributable to items credited (charged) to equity and goodwill	$ (128)	$ (299)	$ (114)
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
Tax on international activities	(6.40%)	(8.10%)	(2.00%)
Tax audit settlements	(0.70%)	(2.90%)	0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	8.90%	0.00%	0.00%
Other	(0.20%)	(0.20%)	(0.40%)
Effective income tax rate	36.60%	23.80%	32.60%
Income Tax Credits and Adjustments			$ 68
2011 - 2012 Tax Years [Member]
Income Tax Contingency [Line Items]
Tax Adjustments Settlements And Unusual Provisions		$ 206
French Tax Law Change [Member]
Income Tax Contingency [Line Items]
Income Tax Credits and Adjustments	$ 48	$ 25
Foreign Earnings Repatriation [Member]
Income Tax Contingency [Line Items]
Other Information Pertaining To Income Taxes, Monetary			274
Tax Year 2015 [Member]
Income Tax Contingency [Line Items]
Other Information Pertaining To Income Taxes, Monetary			$ 45
Tax Year 2016 [Member]
Income Tax Contingency [Line Items]
Tax Adjustments Settlements And Unusual Provisions	55
US TCJA Tax Law Change [Member]
Income Tax Contingency [Line Items]
Tax Adjustments Settlements And Unusual Provisions	$ 690

Income Taxes (Tax Carryforwards) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Insurance and employee benefits	$ 928	$ 2,382
Other asset basis differences	798	1,098
Other liability basis differences	1,158	1,403
Tax loss carryforwards	544	494
Tax credit carryforwards	948	873
Valuation allowances	582	545
Future Income Tax Benefits	3,794	5,705
Other Asset Basis Differences	3,415	5,376
Other items, net	411	364
Future Income Taxes Payable	3,826	$ 5,740
Tax Credit Carryforwards	948
Tax Loss Carryforwards	2,826
Expiration Period Current To Five Years [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	22
Tax Loss Carryforwards	307
Expiration Period Six To Ten Years [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	33
Tax Loss Carryforwards	218
Expiration Period Eleven To Twenty Years [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	269
Tax Loss Carryforwards	359
Expiration Period Indefinite [Member]
Tax Credit Carryforward [Line Items]
Tax Credit Carryforwards	624
Tax Loss Carryforwards	$ 1,942

Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Examination [Line Items]
Balance at January 1				$ 1,086	$ 1,169	$ 1,089
Additions for tax positions related to the current year				192	69	206
Additions for tax positions of prior years				73	167	99
Reductions for tax positions of prior years				91	61	101
Settlements				71	258	124
Balance at December 31		$ 1,086		1,189	1,086	1,169
Gross interest expense related to unrecognized tax benefits				34	41	39
Total accrued interest balance at December 31		185		215	$ 185	$ 176
Minimum [Member]
Income Tax Examination [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible				40
Maximum [Member]
Income Tax Examination [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible				$ 435
Closure of IRS audit of Goodrich Corporation Tax Years 2011-2012 [Member]
Income Tax Examination [Line Items]
Tax Settlement Gain (Loss) Noncash			$ 58
Closure of IRS audit of UTC Tax Years 2011-2012 [Member]
Income Tax Examination [Line Items]
Tax Settlement Gain (Loss) Noncash		172
Tax Settlement Interest Gain (Loss) Noncash		$ 22
Closure of IRS audit of UTC Tax Year 2013 [Member]
Income Tax Examination [Line Items]
Tax Settlement Gain (Loss) Noncash	$ 64
Tax Settlement Interest Gain (Loss) Noncash	$ 9

Employee Benefit Plans (Employee Savings Plans) (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan [Abstract]
Contributions to employer sponsored defined contribution plans	$ 351	$ 318	$ 356
Employee Stock Ownership Plan (ESOP), Plan Description	Our non-union domestic employee savings plan uses an Employee Stock Ownership Plan (ESOP) for employer matching contributions. External borrowings were used by the ESOP to fund a portion of its purchase of ESOP stock from us. The external borrowings have been extinguished and only re-amortized loans remain between UTC and the ESOP Trust. As ESOP debt service payments are made, common stock is released from an unreleased shares account. ESOP debt may be prepaid or re-amortized to either increase or decrease the number of shares released so that the value of released shares equals the value of plan benefit. We may also, at our option, contribute additional common stock or cash to the ESOP.Shares of common stock are allocated to employees' ESOP accounts at fair value on the date earned. Cash dividends on common stock held by the ESOP are used for debt service payments. Participants may choose to have their ESOP dividends reinvested or distributed in cash. Common stock allocated to ESOP participants is included in the average number of common shares outstanding for both basic and diluted earnings per share.
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares	26.0
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares	10.5
Employee Stock Ownership Plan (ESOP), Deferred Shares, Fair Value	$ 1,300

Employee Benefit Plans (Pension and Postretirement Plans) (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2017

Dec. 31, 2016

Defined Benefit Plan Disclosure [Line Items]

Other

$ (116)

$ 542

$ 326

Beginning Balance, Plan Assets

30,555

Ending Balance, Plan Assets

35,689

30,555

Noncurrent liability

$ 3,036

$ 5,612

Payment for Pension Benefits

2,112

303

147

Current year actuarial gain

(241)

785

284

Current year prior service cost/credit

(2)

Amortization of prior service credit

529

535

867

Other Postretirement Benefits Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Beginning Balance, Benefit Obligation

805

890

Service Cost

Interest cost

Actuarial loss (gain)

(4)

(48)

Total benefits paid

Other

Ending Balance, Benefit Obligation

767

805

890

Beginning Balance, Plan Assets

Employer Contributions

Defined Benefit Plan, Plan Assets, Benefits Paid

Other

Ending Balance, Plan Assets

Benefit obligations

805

890

767

805

Funded status of plan

(767)

(805)

Current liability

Noncurrent liability

695

727

Net amount recognized

(767)

(805)

Net actuarial gain

143

152

Prior service credit

(10)

(5)

Net amount recognized

(153)

$ (157)

Amortization of prior service credit

(1)

Recognized actuarial net (gain) loss - in net periodic cost

(9)

(4)

Impact of change in estimation of NPPC

Net settlement and curtailment gain

$ 0

$ (1)

Current year actuarial gain

(2)

Amortization of actuarial gain

Current year prior service cost/credit

(6)

Amortization of prior service credit

(1)

Other

Total recognized in other comprehensive loss

Net recognized in net periodic pension cost and other comprehensive loss

$ 25

Net actuarial loss/gain

(10)

Prior service credit

$ 3

Discount rate, benefit obligation

3.40%

3.80%

Discount rate, net cost

3.80%

4.00%

3.80%

Health care cost trend rate assumed for next year

7.00%

6.50%

Rate that the cost trend rate gradually declines to

5.00%

Year that the rate reaches the rate it is assumed to remain at

2026

2022

Effect on total service and interest cost - increase

$ 2

Effect on postretirement benefit obligation - increase

Effect on total service and interest cost - decrease

Effect on postretirement benefit obligation - decrease

Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Beginning Balance, Benefit Obligation

34,923

$ 35,428

Service Cost

374

383

$ 493

Interest cost

1,120

1,183

1,399

Actuarial loss (gain)

1,804

1,831

Total benefits paid

1,782

1,660

Net settlement, curtailment, and special termination benefits

(49)

(1,566)

Other

609

(676)

Ending Balance, Benefit Obligation

36,999

34,923

35,428

Beginning Balance, Plan Assets

30,555

31,011

Actual return on plan assets

4,258

3,202

Employer Contributions

2,188

384

Defined Benefit Plan, Plan Assets, Benefits Paid

1,782

1,660

Settlements

1,632

Other

(511)

750

Ending Balance, Plan Assets

35,689

30,555

31,011

Fair value of plan assets

$ 20,438

$ 27,943

Benefit obligations

34,923

35,428

36,999

34,923

Funded status of plan

(1,310)

(4,368)

Noncurrent assets

957

451

Current liability

Noncurrent liability

2,197

4,747

Net amount recognized

(1,310)

(4,368)

Net actuarial gain

(7,238)

(7,941)

Prior service credit

(6)

Net amount recognized

7,275

7,935

Projected benefit obligation

22,360

32,732

Accumulated benefit obligation

22,159

$ 32,095

Expected return on plan assets

2,215

2,202

2,264

Amortization of prior service credit

(36)

(33)

(11)

Recognized actuarial net (gain) loss - in net periodic cost

575

572

882

Impact of change in estimation of NPPC

(179)

401

649

Net settlement and curtailment gain

$ 498

$ 150

Current year actuarial gain

(239)

Amortization of actuarial gain

(575)

Current year prior service cost/credit

Amortization of prior service credit

(36)

Net settlement and curtailment loss

(11)

Other

125

Total recognized in other comprehensive loss

(660)

Net recognized in net periodic pension cost and other comprehensive loss

$ (839)

Net actuarial loss/gain

(402)

Prior service credit

(41)

Total amount to be amortized from AOCI to NPPC

$ 361

Salary scale, benefit obligation

4.20%

4.10%

Expected return on plan assets, benefit obligation

0.00%

Salary scale, net cost

4.10%

4.20%

Expected return on plan assets, net cost

7.30%

7.60%

PBO [Member] | Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Discount rate, benefit obligation

3.40%

3.80%

Discount rate, net cost

3.80%

4.10%

3.80%

Interest cost [Member] | Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Discount rate, benefit obligation

0.00%

Discount rate, net cost

3.30%

3.40%

0.00%

Service cost [Member] | Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Discount rate, benefit obligation

0.00%

Discount rate, net cost

3.60%

3.80%

0.00%

Real Estate [Member]

Defined Benefit Plan Disclosure [Line Items]

Beginning Balance, Plan Assets

$ 1,815

Ending Balance, Plan Assets

1,857

^[1],[2]

$ 1,815

Private Equity Funds [Member]

Defined Benefit Plan Disclosure [Line Items]

Beginning Balance, Plan Assets

1,361

Ending Balance, Plan Assets

$ 1,216

^[1],[3]

$ 1,361

[1]	In accordance with ASU 2015-07, Fair Value Measurement (Topic 820), certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented for the total pension benefits plan assets.
[2]	Represents investments in real estate including commingled funds and directly held properties.
[3]	Represents limited partner investments with general partners that primarily invest in debt and equity.

Employee Benefit Plans (Pension Plans) (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change		$ (116,000,000)	$ 542,000,000	$ 326,000,000
Payment for Pension Benefits		2,112,000,000	303,000,000	147,000,000
Domestic Defined Benefit Plan Stock Contributions By Employer		0	0	250,000,000
Defined Benefit Plan, Accumulated Benefit Obligation	$ 34,200,000,000	36,200,000,000	34,200,000,000
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Payment for Pension Benefits		212,000,000	203,000,000
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Payment for Pension Benefits		1,900,000,000	100,000,000
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change		$ 609,000,000	(676,000,000)
Pension Payout Program, Voluntary Lump-Sum Value			170,000,000
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits		74.00%
Percentage Of Projected Benefit Obligation Comprised Of Foreign Plan Benefits		25.00%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		$ (179,000,000)	401,000,000	649,000,000
Range Of Growth Seeking Assets In Company's Overall Investment Strategy		50% to 55%
Range Of Income Generating Assets In Company's Overall Investment Strategy		45% to 50%
Pecentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge		55% to 60%
Defined Benefit Plan Common Stock Funded Percentage		1.00%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 100,000,000
Expected return on plan assets		2,215,000,000	2,202,000,000	2,264,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months		2,044,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Two		1,903,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Three		1,952,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Four		2,004,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Five		2,054,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter		10,710,000,000
Pension Plan [Member] \| Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets		$ 0.07
Pension de-risking actions [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change			1,500,000,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	$ (423,000,000)
Purchase of Annuity Contract [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change			768,000,000
Lump Sum Payments [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change			$ 935,000,000
Change in Assumptions for Defined Benefit Plans [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Change in Accounting Estimate, Description			At the end of fiscal 2015, we changed the approach we use to estimate the service and interest components of net periodic pension cost for our significant pension plans. This change compared to the previous approach resulted in a net decrease in the service and interest components of our annual net periodic pension cost of approximately $215 million for 2016. Historically, we estimated the service and interest cost components utilizing a single-weighted average discount rate derived from the yield curve used to measure the benefit obligation at the beginning of the period. We have elected to utilize a full yield curve approach in the estimation of these components by applying the specific spot rates along the yield curve used in determination of the benefit obligation to the relevant projected cash flows. We have made this change to provide a more precise measurement of service and interest costs by improving the correlation between projected benefit cash flows to the corresponding spot yield curve rates. This change does not materially affect the measurement of our total benefit obligations.
Impact of change in estimation of NPPC			$ (215,000,000)
Discontinued Operations [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment				(109,000,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)				$ 98,000,000

Employee Benefit Plans (Postretirement Benefit Plans) (Narrative) (Details) - Other Postretirement Benefits Plan [Member] $ in Millions	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits	85.00%
Future Amortization of Gain	$ 10
Future amortization of prior service credit	3
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	72
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	67
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	64
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	59
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	54
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 225

Employee Benefit Plans (Multiemployer Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Multiemployer Plans [Line Items]
Multiemployer Plans General Nature	The risks of participating in these multiemployer plans are different from single-employer plans in that assets contributed are pooled and may be used to provide benefits to employees of other participating employers. If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. Lastly, if we choose to stop participating in some of our multiemployer plans, we may be required to pay those plans a withdrawal liability based on the underfunded status of the plan.
Multiemployer Plans Period Contributions	$ 145	$ 131	$ 120
Multiemployer Plans Period Contributions Other Than Pensions	$ 19	$ 17	15
National Elevator Industry Plan [Member]
Multiemployer Plans [Line Items]
Entity Tax Identification Number	232694291
Multiemployer Plans Certified Zone Status	Green	Green
Multiemployer Plans Funding Improvement Plan And Rehabilitation Plan	No
Multiemployer Plans Period Contributions	$ 114	$ 100	88
Multiemployer Plans Surcharge	No
Multiemployer Plans Collective Bargaining Arrangement Expiration Date	Jul. 08, 2022
Multiemployer Plans, Period Contributions, Significance of Contributions [true/false]	1	1
Other Funds [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans Period Contributions	$ 31	$ 31	$ 32

Employee Benefit Plans (Stock Based Compensation) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Cost of Share Based Payments

$ 192

$ 153

$ 175

Expected Volatility

19.00%

20.00%

Expected Volatility, Minimum

20.00%

Expected Volatility, Maximum

23.00%

Expected term (in years)

6 years 6 months

Weighted-average volatility

19.00%

20.00%

21.00%

Expected dividend yield

2.40%

2.70%

2.20%

Risk-free rate, minimum

0.50%

0.20%

0.00%

Risk-free rate, maximum

2.50%

2.60%

2.20%

Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expected term (in years)

6 years 9 months

Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Expected term (in years)

6 years

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

December 31, 2015, Shares

2,023

Granted, Shares

231

Exercised/earned, Shares

369

Cancelled, Shares

(103)

Other, Shares

(37)

December 31, 2016, Shares

1,745

2,023

December 31, 2015, Average Price

^[1]

$ 89.72

Granted, Average Price

^[1]

110.81

Exercised/Earned, Average Price

^[1]

77.17

Cancelled, Average Price

^[1]

102.00

Other, Average Price

^[1]

94.30

December 31, 2016, Average Price

^[1]

$ 94.35

$ 89.72

Stock Appreciation Rights (SARs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

December 31, 2015, Shares

36,413

Granted, Shares

3,464

Exercised/earned, Shares

6,770

Cancelled, Shares

(720)

Other, Shares

335

December 31, 2016, Shares

32,722

36,413

December 31, 2015, Average Price

^[1]

$ 87.18

Granted, Average Price

^[1]

110.91

Exercised/Earned, Average Price

^[1]

72.86

Cancelled, Average Price

^[1]

95.23

Other, Average Price

^[1]

92.54

December 31, 2016, Average Price

^[1]

$ 92.54

$ 87.18

Performance Share Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

December 31, 2015, Shares

1,967

Granted, Shares

614

Exercised/earned, Shares

Cancelled, Shares

(699)

Other, Shares

(4)

December 31, 2016, Shares

1,876

1,967

December 31, 2015, Average Price

^[2]

$ 107.05

Granted, Average Price

^[2]

110.83

Exercised/Earned, Average Price

^[2]

107.78

Cancelled, Average Price

^[2]

112.16

Other, Average Price

^[2]

106.38

December 31, 2016, Average Price

^[2]

$ 106.38

$ 107.05

Other Incentive Shares/Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

December 31, 2015, Shares

2,033

Granted, Shares

1,006

Exercised/earned, Shares

441

Cancelled, Shares

(123)

Other, Shares

(293)

December 31, 2016, Shares

2,182

2,033

Stock Options/Stock Appreciation Rights SARS [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Awards Vested and Expected to Vest, Awards

34,183

Equity Awards Vested and Expected to Vest, Average Price

^[3]

$ 91.85

Equity Awards Vested and Expected to Vest, Average Intrinsic Value

$ 1,221

Equity Awards Vested and Expected to Vest, Remaining Term

5 years 6 months

Equity Awards That Are Exercisable, Awards

21,990

Equity Awards That Are Exercisable, Average Price

^[3]

$ 84.34

Equity Awards That Are Exercisable, Aggregate Intrinsic Value

$ 951

Equity Awards That Are Exercisable, Remaining Term

4 years 2 months 12 days

Performance Share Units/Other Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Equity Awards Vested and Expected to Vest, Awards

3,462

Equity Awards Vested and Expected to Vest, Average Price

^[3]

$ 0

Equity Awards Vested and Expected to Vest, Average Intrinsic Value

$ 442

Equity Awards Vested and Expected to Vest, Remaining Term

2 years 1 month

Continuing operations [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Cost of Share Based Payments

$ 192

$ 152

$ 158

Discontinued operations

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Cost of Share Based Payments

$ 0

$ 1

$ 17

[1]	weighted-average exercise price
[2]	weighted-average grant stock price
[3]	weighted-average exercise price per share

Employee Benefit Plans (Stock Based Compensation) (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	149
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	29
Expected Range Of Shares Awarded Annually Under Long Term Incentive Plan	1.0% to 1.5%
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 38	$ 49	$ 57
Proceeds from Stock Options Exercised	29	17	41
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	100	69	89
Employee Service Share Based Compensation Tax Benefit Realized From Vesting Of Performance Share Units	12	17	48
Employee Service Share Based Compensation Cash Flow Tax Benefit Reported			64
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	175
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Vested In Period Total Fair Value	$ 138	$ 165	$ 247
Stock Options/Stock Appreciation Rights SARS [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 17.22	$ 14.02	$ 18.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 320	$ 214	$ 281
Performance Share Units/Other Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Options and Other Restricted Awards Exercised In Period Total Intrinsic Value	$ 49	$ 61	$ 151
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 111.00	$ 91.63	$ 120.36

Restructuring and Other Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 253
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	119
Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	134
Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	176
Restructuring Reserve	85
Net pre-tax restructuring costs (reversals)	176
Utilization and foreign exchange	91
Expected Costs	298
Remaining Costs	122
Current Year Actions [Member] \| Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	70
Current Year Actions [Member] \| Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	106
Current Year Actions [Member] \| Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	84
Net pre-tax restructuring costs (reversals)	160
Utilization and foreign exchange	76
Current Year Actions [Member] \| Facility Exit, Lease Termination and Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1
Net pre-tax restructuring costs (reversals)	16
Utilization and foreign exchange	15
Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	57
Restructuring Reserve	84	$ 109
Net pre-tax restructuring costs (reversals)	57	242
Utilization and foreign exchange	82
Expected Costs	333
Remaining Costs	34
Prior Year Actions [Member] \| Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	22
Prior Year Actions [Member] \| Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	35
Prior Year Actions [Member] \| Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	34
Restructuring Reserve	32	63
Utilization and foreign exchange	65
Prior Year Actions [Member] \| Facility Exit, Lease Termination and Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	23
Restructuring Reserve	52	46
Utilization and foreign exchange	17
Two Years Prior Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	20
Restructuring Reserve	43
Otis [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	50
Otis [Member] \| Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (reversals)	43
Expected Costs	79
Remaining Costs	36
Otis [Member] \| Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (reversals)	5	48
Expected Costs	57
Remaining Costs	4
UTC Climate, Controls and Security [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	111
UTC Climate, Controls and Security [Member] \| Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (reversals)	76
Expected Costs	87
Remaining Costs	11
UTC Climate, Controls and Security [Member] \| Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (reversals)	21	45
Expected Costs	79
Remaining Costs	13
Pratt and Whitney [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	5
Pratt and Whitney [Member] \| Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (reversals)	7
Expected Costs	7
Remaining Costs	0
Pratt and Whitney [Member] \| Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (reversals)	0	118
Expected Costs	118
Remaining Costs	0
UTC Aerospace Systems [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	80
UTC Aerospace Systems [Member] \| Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (reversals)	43
Expected Costs	118
Remaining Costs	75
UTC Aerospace Systems [Member] \| Prior Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (reversals)	31	$ 31
Expected Costs	79
Remaining Costs	17
Eliminations and other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	7
Eliminations and other [Member] \| Current Year Actions [Member]
Restructuring Cost and Reserve [Line Items]
Net pre-tax restructuring costs (reversals)	(7)
Expected Costs	7
Remaining Costs	$ 0

Financial Instruments (Narrative) (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 EUR (€)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Four Quarter Rolling Average Of Notional Amount Of Foreign Exchange Contracts Hedging Foreign Currency Transactions	$ 19,100	$ 18,300
Derivatives designated as hedging instruments - assets	178	15
Derivatives not designated as hedging instruments - assets	75	155
Derivatives designated as hedging instruments - liabilities	18	196
Derivatives not designated as hedging instruments - liabilities	60	158
Hedging Liabilities, Noncurrent \| €				€ 3,700
Gain recorded in Accumulated other comprehensive loss	347	75
(Gain) loss reclassified from Accumulated other comprehensive loss into Product sales (effective portion)	(39)	171
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	$ (66)
Maximum Length of Time, Foreign Currency Cash Flow Hedge	3 years 11 months 21 days
Gain recognized in Other income, net	$ 77	56
Payments for (Proceeds from) Derivative Instrument, Investing Activities	$ 317	$ (249)	$ (160)

Fair Value Measurements (Fair Value Hierarchy) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 64	$ 987
Derivative Assets	253	170
Derivative liabilities	78	354
Recurring fair value measurements \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	64	987
Derivative Assets	0	0
Derivative liabilities	0	0
Recurring fair value measurements \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Derivative Assets	253	170
Derivative liabilities	78	354
Recurring fair value measurements \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Derivative Assets	0	0
Derivative liabilities	$ 0	$ 0

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Fair Value Measurements (Fair Value Techniques) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	$ 127	$ 127
Customer Financing Notes Receivable	609	437
Short-term Debt	392	600
Long-term debt (excluding capitalized leases)	27,067	23,280
Long-term liabilities	362	457
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	121	121
Customer Financing Notes Receivable	596	420
Short-term Debt	392	600
Long-term debt (excluding capitalized leases)	29,180	25,110
Long-term liabilities	330	$ 427
Level 1 \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	0
Customer Financing Notes Receivable	0
Short-term Debt	0
Long-term debt (excluding capitalized leases)	0
Long-term liabilities	0
Level 2 \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	121
Customer Financing Notes Receivable	596
Short-term Debt	300
Long-term debt (excluding capitalized leases)	28,970
Long-term liabilities	330
Level 3 \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term receivables	0
Customer Financing Notes Receivable	0
Short-term Debt	92
Long-term debt (excluding capitalized leases)	210
Long-term liabilities	$ 0

Variable Interest Entities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Total Assets	$ 5,510	$ 4,056
Total Liabilities	5,687	4,058
Current Assets [Member]
Variable Interest Entity [Line Items]
Total Assets	3,976	2,722
Noncurrent Assets [Member]
Variable Interest Entity [Line Items]
Total Assets	1,534	1,334
Current Liabilities [Member]
Variable Interest Entity [Line Items]
Total Liabilities	3,601	2,422
Noncurrent Liabilities [Member]
Variable Interest Entity [Line Items]
Total Liabilities	$ 2,086	$ 1,636
International Aero Engines AG [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Methodology	Pratt & Whitney holds a 61% interest in the IAE International Aero Engines AG (IAE) collaboration with MTU Aero Engines AG (MTU) and Japanese Aero Engines Corporation (JAEC) and a 49.5% ownership interest in IAE. IAE's business purpose is to coordinate the design, development, manufacturing and product support of the V2500 program through involvement with the collaborators.
Variable Interest Entity, Ownership Percentage	49.50%
International Aero Engines LLC [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Methodology	Additionally, Pratt & Whitney, JAEC and MTU are participants in International Aero Engines, LLC (IAE LLC), whose business purpose is to coordinate the design, development, manufacturing and product support for the PW1100G-JM engine for the Airbus A320neo aircraft and the PW1400G-JM engine for the Irkut MC21 aircraft. Pratt & Whitney holds a 59% net interest and a 59% ownership interest in IAE LLC. IAE and IAE LLC retain limited equity with the primary economics of the programs passed to the participants.
Variable Interest Entity, Ownership Percentage	59.00%

Guarantees (Details) - USD ($)	12 Months Ended
Guarantees (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Guarantee Obligations [Line Items]
Environmental, health and safety, tax and employment matters	$ 179,000,000	$ 171,000,000
Balance as of January 1	1,199,000,000	1,212,000,000
Warranties and performance guarantees issued	323,000,000	246,000,000
Settlements made	207,000,000	240,000,000
Other	9,000,000	(19,000,000)
Balance as of December 31	1,324,000,000	1,199,000,000
Commercial aerospace financing arrangements (see Note 5)
Guarantee Obligations [Line Items]
Maximum Potential Payment	336,000,000	348,000,000
Carrying Amount of Liability	8,000,000	14,000,000
Credit Facilities And Debt Obligations (expire 2018 to 2028)
Guarantee Obligations [Line Items]
Maximum Potential Payment	256,000,000	270,000,000
Carrying Amount of Liability	15,000,000	15,000,000
Performance Guarantees
Guarantee Obligations [Line Items]
Maximum Potential Payment	56,000,000	55,000,000
Carrying Amount of Liability	$ 2,000,000	$ 4,000,000

Contingent Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
Contingent Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Operating Leases Future Minimum Payments Due	$ 2,252
Operating Leases Future Minimum Payments Due Current	498
Operating Leases Future Minimum Payments Due In Two Years	430
Operating Leases Future Minimum Payments Due In Three Years	325
Operating Leases Future Minimum Payments Due In Four Years	221
Operating Leases Future Minimum Payments Due In Five Years	143
Operating Leases Future Minimum Payments Due Thereafter	635
Rent Expense	411	$ 386
Accrual For Environmental Loss Contingencies	$ 830	$ 829
German Tax Office Against Otis [Member]
Loss Contingencies [Line Items]
Loss Contingency Lawsuit Filing Date	8/3/2012
Loss Contingency Allegations	As previously disclosed, UTC has been involved in administrative review proceedings with the German Tax Office, which concern approximately €215 million (approximately $256 million) of tax benefits that we have claimed related to a 1998 reorganization of the corporate structure of Otis operations in Germany. Upon audit, these tax benefits were disallowed by the German Tax Office. UTC estimates interest associated with the aforementioned tax benefits is an additional approximately €118 million (approximately $140 million). On August 3, 2012, we filed suit in the local German Tax Court (Berlin-Brandenburg). In March 2016, the local German Tax Court dismissed our suit, and we have appealed this decision to the German Federal Tax Court (FTC).
Loss Contingency Damages Sought	€215 million (approximately $256 million)
Loss Contingency Actions Taken By Defendant	In 2015, UTC made tax and interest payments to German tax authorities of €275 million (approximately $300 million) in order to avoid additional interest accruals pending final resolution of this matter. In the meantime, we continue vigorously to litigate this matter.
Loss Contingency, Interest	€118 million (approximately $140 million)
Loss Contingency, Interest Paid	€275 million (approximately $300 million)
U.S. Defense Contract Management Claim against Pratt & Whitney
Loss Contingencies [Line Items]
Loss Contingency Lawsuit Filing Date	December 24, 2013
Loss Contingency Allegations	As previously disclosed, in December 2013, a Divisional Administrative Contracting Officer of the United States Defense Contract Management Agency asserted a claim against Pratt & Whitney to recover overpayments of approximately $177 million plus interest (approximately $72.4 million through December 31, 2017). The claim is based on Pratt & Whitney's alleged noncompliance with cost accounting standards from January 1, 2005 to December 31, 2012, due to its method of determining the cost of collaborator parts used in the calculation of material overhead costs for government contracts.
Loss Contingency Damages Sought	$177 million
Loss Contingency Actions Taken By Defendant	On March 18, 2014, Pratt & Whitney filed an appeal to the Armed Services Board of Contract Appeals. Pratt & Whitney’s appeal is still pending and we continue to believe the government’s claim is without merit.
Loss Contingency, Interest	$72.4 million
Asbestos Matter [Member]
Loss Contingencies [Line Items]
Loss Contingency Allegations	As previously disclosed, like many other industrial companies, we and our subsidiaries have been named as defendants in lawsuits alleging personal injury as a result of exposure to asbestos integrated into certain of our products or business premises. While we have never manufactured asbestos and no longer incorporate it in any currently-manufactured products, certain of our historical products, like those of many other manufacturers, have contained components incorporating asbestos. A substantial majority of these asbestos-related claims have been dismissed without payment or were covered in full or in part by insurance or other forms of indemnity. Additional cases were litigated and settled without any insurance reimbursement. The amounts involved in asbestos related claims were not material individually or in the aggregate in any year.
Loss Contingency, Management's Assessment and Process	Our estimated total liability to resolve all pending and unasserted potential future asbestos claims through 2059 is approximately $344 million and is principally recorded in Other long-term liabilities on our Consolidated Balance Sheet as of December 31, 2017. This amount is on a pre-tax basis, not discounted, and excludes the Company’s legal fees to defend the asbestos claims (which will continue to be expensed by the Company as they are incurred). In addition, the Company has an insurance recovery receivable for probable asbestos related recoveries of approximately $120 million, which is included primarily in Other assets on our Consolidated Balance Sheet as of December 31, 2017. The amounts recorded by UTC for asbestos-related liabilities and insurance recoveries are based on currently available information and assumptions that we believe are reasonable. Our actual liabilities or insurance recoveries could be higher or lower than those recorded if actual results vary significantly from the assumptions. Key variables in these assumptions include the number and type of new claims to be filed each year, the outcomes or resolution of such claims, the average cost of resolution of each new claim, the amount of insurance available, allocation methodologies, the contractual terms with each insurer with whom we have reached settlements, the resolution of coverage issues with other excess insurance carriers with whom we have not yet achieved settlements, and the solvency risk with respect to our insurance carriers. Other factors that may affect our future liability include uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, legal rulings that may be made by state and federal courts, and the passage of state or federal legislation. At the end of each year, the Company will evaluate all of these factors and, with input from an outside actuarial expert, make any necessary adjustments to both our estimated asbestos liabilities and insurance recoveries.
Loss Contingency, Estimate of Possible Loss	$ 344
Loss Contingency, Receivable	$ 120

Segment Financial Data (By Segment) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating profit									$ 8,672	$ 8,172	$ 7,291
Total Assets	$ 96,920				$ 89,706				96,920	89,706	87,484
Capital Expenditures									2,014	1,699	1,652
Depreciation & Amortization									2,140	1,962	1,863
Major Customers, U.S. Government Sales									5,798	5,626	5,630
Net Sales	15,680	$ 15,062	$ 15,280	$ 13,815	14,659	$ 14,354	$ 14,874	$ 13,357	59,837	57,244	56,098
Major Customers, Airbus Sales									8,908	7,688	$ 7,624
Sikorsky [Member]
Segment Reporting Information [Line Items]
Disposal Date											Nov. 06, 2015
Major Customers, U.S. Government Sales										3,100
UTC Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Operating profit									2,370	2,298	$ 1,888
Total Assets	34,567				34,093				34,567	34,093	34,736
Capital Expenditures									527	452	537
Depreciation & Amortization									823	807	796
Major Customers, U.S. Government Sales									2,299	2,301	2,409
Net Sales									14,691	14,465	14,094
Total Segments [Member]
Segment Reporting Information [Line Items]
Operating profit									9,151	8,946	8,023
Total Assets	93,413				87,718				93,413	87,718	85,205
Capital Expenditures									1,909	1,611	1,573
Depreciation & Amortization									2,044	1,882	1,785
Net Sales									61,004	58,103	56,863
Eliminations and other [Member]
Segment Reporting Information [Line Items]
Operating profit									(38)	(368)	(268)
Total Assets	3,507				1,988				3,507	1,988	2,279
Capital Expenditures									105	88	79
Depreciation & Amortization									96	80	78
Net Sales									(1,167)	(859)	(765)
General corporate expenses [Member]
Segment Reporting Information [Line Items]
Operating profit									(441)	(406)	(464)
Net Sales									0	0	0
Other [Member]
Segment Reporting Information [Line Items]
Major Customers, U.S. Government Sales									152	138	276
Otis [Member]
Segment Reporting Information [Line Items]
Operating profit									2,021	2,147	2,338
Total Assets	9,421				8,867				9,421	8,867	8,846
Capital Expenditures									133	94	83
Depreciation & Amortization									177	171	176
Net Sales									12,341	11,893	11,980
UTC Climate, Controls and Security [Member]
Segment Reporting Information [Line Items]
Operating profit									3,300	2,956	2,936
Total Assets	22,657				21,787				22,657	21,787	21,287
Capital Expenditures									326	340	261
Depreciation & Amortization									372	354	337
Net Sales									17,812	16,851	16,707
Pratt and Whitney [Member]
Segment Reporting Information [Line Items]
Operating profit									1,460	1,545	861
Total Assets	$ 26,768				$ 22,971				26,768	22,971	20,336
Capital Expenditures									923	725	692
Depreciation & Amortization									672	550	476
Major Customers, U.S. Government Sales									3,347	3,187	2,945
Net Sales									$ 16,160	$ 14,894	$ 14,082

Segment Financial Data (By Geographic Region) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
External Net Sales by Geography	59837	57244	56098
United States Export Sales	$ 11,124	$ 10,827	$ 9,741
Operating profit by Geography	$ 8,672	$ 8,172	$ 7,291
Long-Lived Assets by Geography	10186	9158	8732
United States Operations
External Net Sales by Geography	33912	32335	30989
Operating profit by Geography	$ 4,528	$ 4,566	$ 4,391
Long-Lived Assets by Geography	5323	4822	4517
Europe [Member]
External Net Sales by Geography	11879	11151	10945
United States Export Sales	$ 5,273	$ 5,065	$ 4,366
Operating profit by Geography	$ 2,058	$ 1,933	$ 1,882
Long-Lived Assets by Geography	1817	1538	1525
Asia Pacific [Member]
External Net Sales by Geography	8770	8260	8425
United States Export Sales	$ 3,634	$ 3,449	$ 2,902
Operating profit by Geography	$ 1,488	$ 1,484	$ 1,641
Long-Lived Assets by Geography	1113	999	994
Other
External Net Sales by Geography	5262	5479	5584
United States Export Sales	$ 2,217	$ 2,313	$ 2,473
Operating profit by Geography	$ 1,077	$ 963	$ 109
Long-Lived Assets by Geography	1389	1325	1273
Eliminations and other
External Net Sales by Geography	14	19	155
Operating profit by Geography	$ (479)	$ (774)	$ (732)
Long-Lived Assets by Geography	544	474	423

Selected Quarterly Financial Data - Unaudited (Details) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Mar. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares	Sep. 30, 2016 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares	Jan. 31, 2018
Selected Quarterly Financial Information [Abstract]
Net Sales \| $	$ 15,680	$ 15,062	$ 15,280	$ 13,815	$ 14,659	$ 14,354	$ 14,874	$ 13,357	$ 59,837	$ 57,244	$ 56,098
Gross margin \| $	3,947	4,019	4,180	3,738	3,936	4,012	4,133	3,703
Net income attributable to common shareowners \| $	$ 397	$ 1,330	$ 1,439	$ 1,386	$ 1,013	$ 1,480	$ 1,379	$ 1,183	$ 4,552	$ 5,055	$ 7,608
Earnings Per Share of Common Stock - Basic and Diluted:
Basic - net income	$ 0.50	$ 1.69	$ 1.83	$ 1.75	$ 1.26	$ 1.80	$ 1.67	$ 1.43	$ 5.76	$ 6.18	$ 8.72
Diluted - net income	0.50	1.67	1.80	1.73	1.25	1.78	1.65	1.42	5.70	6.12	8.61
Common Stock Price - High	128.12	123.71	122.50	113.68	110.98	109.69	105.89	100.25
Common Stock Price - Low	116.38	109.55	111.93	108.18	98.67	100.10	97.21	84.66
Dividend	$ 0.70	$ 0.70	$ 0.66	$ 0.66	$ 0.66	$ 0.66	$ 0.66	$ 0.64	$ 2.72	$ 2.62	$ 2.56
Registered Shareholders Total												18,393

Performance Graph - Unaudited (Details) - USD ($)	12 Months Ended
Performance Graph - Unaudited (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
United Technologies Corporation
Performance Graph [Line Items]
December, Graph Details	$ 174.62	$ 146.66	$ 125.30	$ 146.39	$ 141.87	$ 100.00
S&P 500 Index
Performance Graph [Line Items]
December, Graph Details	208.14	170.84	152.59	150.51	132.39	100.00
Dow Jones Industrial Average
Performance Graph [Line Items]
December, Graph Details	$ 213.38	$ 166.56	$ 142.98	$ 142.67	$ 129.65	$ 100.00