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Long-term Debt, Gross Long-term Debt, Gross Long-term debt currently due Less: current portion Long-term Debt and Lease Obligation, Current Income (loss) from continuing operations Diluted earnings (loss) per share from continuing operations attributable to common shareholders (1) Income (Loss) from Continuing Operations, Per Diluted Share Fair Value Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Goodwill impairment Goodwill Impairment Loss Goodwill, Impairment Loss Document Transition Report Document Transition Report Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Debt Exchanged Debt Exchanged Debt Exchanged Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Fair value adjustments to fixed assets Fair value adjustments to fixed assets Fair value adjustments to fixed assets Total Liabilities, Redeemable Noncontrolling Interest and Equity Liabilities and Equity Notes 3.500% Due 2027 [Member] Notes 3.500% Due 2027 [Member] Notes 3.500% Due 2027 [Member] Total accounts receivable, net Accounts Receivable, after Allowance for Credit Loss Transaction Type [Axis] Transaction Type [Axis] Contract liabilities Contract liabilities Contract with Customer, Liability, Current Scenario [Axis] Scenario [Axis] Advances received to date on contracts related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval Advances received to date on contracts related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval Advances received to date on contracts related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval 2013 U.S. Defense Contract Management Agency Claim Against Pratt & Whitney [Member] U.S. Defense Contract Management Agency Claim Against Pratt & Whitney [Member] U.S. Defense Contract Management Agency Claim Against Pratt & Whitney [Member] Less: Restricted cash, included in Other assets Restricted Cash Restricted Cash Service [Member] Service [Member] Notes 4.500% Due 2020 [Member] Notes 4.500% Due 2020 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. 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Additionally, this adjustments reflects the amortization of the fixed asset fair value adjustment as of the acquisition date. 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This element represents the fair value of customer financing notes receivable. Note 1.125% Due 2021 [Member] Note 1.125% Due 2021 [Member] Debt security issued by a foreign corporate business entity with a promise of repayment. 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Segment Reporting Disclosure [Text Block] Segment Reporting Disclosure [Text Block] Sale of subsidiary shares from noncontrolling interest, net Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Operating profit (loss) Operating profit (loss) Operating Income (Loss) Notes 7.100% Due 2027 [Member] Notes 7.100% Due 2027 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. 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Notes 2.800% Due 2024 [Member] Notes 2.800% Due 2024 [Member] Notes 2.800% Due 2024 [Member] Dividends paid per share of Common Stock Common Stock, Dividends, Per Share, Cash Paid Treasury Stock [Member] Treasury Stock [Member] Product Warranty Disclosure [Table Text Block] Schedule of Product Warranty Liability [Table Text Block] International Aero Engines AG [Member] International Aero Engines AG [Member] Deferred revenue fair value adjustment (4) Pro Forma Nonrecurring Adjustment, Deferred revenue fair value adjustment Pro Forma Nonrecurring Adjustment, Deferred revenue fair value adjustment Goodwill, Transfers Goodwill, Transfers Unearned ESOP Shares Unearned ESOP Shares Revenue from contract with customer [Line Items] Revenue from contract with customer [Line Items] Revenue from contract with customer Asset Impairment Charges Asset Impairment Charges Derivative, Notional Amount Derivative, Notional Amount Guarantees [Text Block] Guarantees [Text Block] Notes 5.700% Due 2040 [Member] Notes 5.700% Due 2040 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. 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Foreign Currency Translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax Product and Service [Axis] Product and Service [Axis] Financing Activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Entity Small Business Entity Small Business New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Equity Component [Domain] Equity Component [Domain] Shares of Common Stock issued under employee plans, net Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Gain (loss) recorded in Accumulated other comprehensive loss Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax Stockholders' Equity, Other Stockholders' Equity, Other Shares of Common Stock repurchased Stock Repurchased During Period, Shares Capital contributions Noncontrolling Interest, Increase from Capital Contributions Noncontrolling Interest, Increase from Capital Contributions Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Disposal Group Name [Domain] Disposal Group Name [Domain] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Statement [Line Items] Statement [Line Items] Litigation Case [Axis] Litigation Case [Axis] Notes 2.242% Due 2025 Notes 2.242% Due 2025 [Member] Notes 2.242% Due 2025 Shares of Common Stock issued for Raytheon Company outstanding common stock & equity awards Stock Issued During Period, Shares, Acquisitions Contract liabilities Increase (Decrease) in Contract with Customer, Liability Total outstanding shares entitled to merger consideration Total outstanding shares entitled to merger consideration Total outstanding shares entitled to merger consideration Commercial paper Commercial Paper RPO Revenue, Remaining Performance Obligation, Amount Notes 6.700% Due 2028 [Member] Notes 6.700% Due 2028 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Costs Incurred Restructuring and Related Cost, Incurred Cost Common Stock plans activity Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Other Commitment Other Commitment Product Warranty Liability [Line Items] Product Warranty Liability [Line Items] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Total Intangible Assets Gross Excluding Goodwill Intangible Assets, Gross (Excluding Goodwill) Cost-type Contract Time-and-materials Contract [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Entity Address, State or Province Entity Address, State or Province Income (loss) from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Fair Value Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Sales Type [Axis] Sales Type [Axis] Sales Type [Axis] Type of Adoption [Domain] Accounting Standards Update [Domain] Corporate, Non-Segment Corporate, Non-Segment [Member] Average Years of Maturity of Long Term Debt Average Years of Maturity of Long Term Debt Average Years of Maturity of Long Term Debt Segment Reporting [Abstract] Segment Reporting [Abstract] Type of Restructuring [Domain] Type of Restructuring [Domain] Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Sales Disposal Group, Including Discontinued Operation, Revenue Customer [Axis] Customer [Axis] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Notes 3.700% Due 2023 [Member] Notes 3.700% Due 2023 [Member] Notes 3.700% Due 2023 [Member] Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount Net cash flows used in financing activities from continuing operations Net Cash Provided by (Used in) Financing Activities, Continuing Operations Pension and Other Postretirement Benefits Disclosure [Text Block] Retirement Benefits [Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Raytheon Company [Member] Raytheon Company [Member] Raytheon Company [Member] Entity Shell Company Entity Shell Company Notes 3.100% Due 2022 [Member] Notes 3.100% Due 2022 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Unrecognized Tax Benefits, Interest on Income Taxes Accrued Unrecognized Tax Benefits, Interest on Income Taxes Accrued Local Phone Number Local Phone Number Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Forecast [Member] Forecast [Member] Other (including finance leases) Other Long-term Debt Contract Asset and Liability [Table] Contract Asset and Liability [Table] Contract Asset and Liability [Table] Notes 6.050% Due 2036 [Member] Notes 6.050% Due 2036 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Long-term liabilities Other long-term liabilities, Fair Value Disclosure This element is used in connection with the recurring fair value measurement disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of other long-term liabilities. Total Assets Assets Assets Income tax (expense) benefit related to items of other comprehensive income (loss) Other Comprehensive Income (Loss), Tax Notes 8.750% Due 2021 [Member] Notes 8.750% Due 2021 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Cash, cash equivalents and restricted cash, beginning of period Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations Expected Costs Restructuring and Related Cost, Expected Cost Net income (loss) attributable to common shareowners: Net Income (Loss) Attributable to Parent [Abstract] Commercial Aerospace Financing Arrangements Commercial Aerospace Financing Arrangements [Member] Commercial Aerospace Financing Arrangements Noncontrolling Interest [Member] Noncontrolling Interest [Member] Research and development Research and Development Expense Product and Service [Domain] Product and Service [Domain] Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Schedule of Receivables, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Two Years Prior Actions [Member] Two Years Prior Actions [Member] Activity related to restructuring programs or actions approved two years prior to the current year Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Net Income Net Income (Loss) Attributable to Noncontrolling Interest Notes 2.300% Due 2022 [Member] Notes 2.300% Due 2022 [Member] Notes 2.300% Due 2022 [Member] Liabilities, Noncurrent Liabilities, Noncurrent Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Table] Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table] Schedule of income (loss) from discontinued operations Schedule of income (loss) from discontinued operations [Table Text Block] Schedule of income (loss) from discontinued operations Foreign Government Direct Commercial Sales Member Foreign Government Direct Commercial Sales Member [Member] Foreign Government Direct Commercial Sales Member Fair value adjustment to future pension and postretirement benefit obligations Fair value adjustment to future pension and postretirement benefit obligations Fair value adjustment to future pension and postretirement benefit obligations Changes in Contract Estimates at Completion Significant Accounting Policies [Text Block] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Short-term borrowings Total short-term borrowings Short-term borrowings Short-term Debt Other Segments Other Segments [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Entity Tax Identification Number Entity Tax Identification Number Other Comprehensive Income (Loss), Defined Benefit Plan, Effect of Separation of Otis and Carrier Other Comprehensive Income (Loss), Defined Benefit Plan, Effect of Separation of Otis and Carrier Other Comprehensive Income (Loss), Defined Benefit Plan, Effect of Separation of Otis and Carrier Earnings (loss) Per Share attributable to common shareowners - Basic: Earnings Per Share, Basic [Abstract] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Notes 3.125% Due 2027 [Member] Notes 3.125% Due 2027 [Member] Notes 3.125% Due 2027 [Member] Notes 4.200% Due 2044 Notes 4.200% Due 2044 [Member] Notes 4.200% Due 2044 Basic weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Basic Net income (loss) attributable to common shareowners Earnings Per Share, Diluted Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Product [Member] Product [Member] Service cost Defined Benefit Plan, Service Cost Less: Redeemable noncontrolling interest net income Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Discontinued operations (Note 3): Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract] Total identifiable assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Amounts reclassified, pretax - Pension Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Comprehensive income (loss) attributable to common shareowners Comprehensive Income (Loss), Net of Tax, Attributable to Parent Severance [Member] Employee Severance [Member] Fixed-price Contract Fixed-price Contract [Member] Schedule of guarantees Schedule of guarantees [Table Text Block] Schedule of guarantees Treasury Stock Treasury Stock, Value Notes 4.800% Due 2043 [Member] Notes 4.800% Due 2043 [Member] Notes 4.800% Due 2043 [Member] Average interest expense rate Average interest expense rate Annualized average interest expense rate on short-term and long-term debt Schedule of Amounts Recognized in Balance Sheet Schedule of Amounts Recognized in Balance Sheet [Table Text Block] Separation related transactions Separation related transactions [Member] Separation related transactions Contract Asset And Inventory Write Offs Contract Asset And Inventory Write Offs Contract Asset And Inventory Write Offs Notes 7.000% Due 2028 Notes 7.000% Due 2028 [Member] Notes 7.000% Due 2028 Notes 3.950% Due 2025 [Member] Notes 3.950% Due 2025 [Member] Notes 3.950% Due 2025 [Member] Notes 1.950% Due 2021 [Member] Notes 1.950% Due 2021 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Fixed assets, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Income (loss) from continuing operations Income (Loss) from Continuing Operations, Per Basic Share Net income (loss) from discontinued operations Income (Loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] LIBOR plus 0.650% floating rate notes due 2021 [Member] LIBOR plus 0.650% floating rate notes due 2021 [Member] LIBOR plus 0.650% floating rate notes due 2021 [Member] Subsegments [Domain] Subsegments [Domain] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Net pre-tax restructuring costs Restructuring Charges Accounts payable Accounts Payable, Current Unfavorable EAC adjustment related to the restructuring of a customer contract Unfavorable EAC adjustment related to the restructuring of a customer contract Unfavorable EAC adjustment related to the restructuring of a customer contract Amortization Expense, 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Three Dividends on Common Stock Dividends, Common Stock Schedule of Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Income (loss) from discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share Notes 3.577% Due 2050 Notes 3.577% Due 2050 [Member] Notes 3.577% Due 2050 AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Amortization Expense, Remaining 2021 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Inventory Increase (Decrease) in Inventories Notes 6.800% Due 2036 [Member] Notes 6.800% Due 2036 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Schedule of Restructuring and Related Costs [Table Text Block] Restructuring and Related Costs [Table Text Block] Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Notes 4.500% Due 2042 [Member] Notes 4.500% Due 2042 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Accounts payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Change in unrealized cash flow hedging Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Balance as of January 1 Balance as of March 31 Standard and Extended Product Warranty Accrual Cost of Sales Cost of Goods and Services Sold Net Sales: Revenues [Abstract] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Increase in collaboration intangible assets Payments to Acquire Intangible Assets Amounts reclassified, pretax - Foreign Currency Translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax Other comprehensive (loss) income before reclassifications, net OCI, before Reclassifications, before Tax, Attributable to Parent Consolidated Entities [Domain] Consolidated Entities [Domain] Investing Activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Prior Year Actions [Member] Prior Year Actions [Member] Activity related to restructuring programs or actions approved in the prior year Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement Location [Domain] Income Statement Location [Domain] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Customer Relationships [Member] Customer relationships Customer Relationships [Member] Adjustment to non-service pension (income) expense (5) Pro Forma Nonrecurring Adjustment, Adjustment to net periodic pension cost Reflects adjustments for the elimination of amortization of prior service cost and actuarial loss amortization, which was recorded by Rockwell Collins, as a result of fair value purchase accounting, net of the impact of the revised pension and post-retirement benefit (expense) as determined under UTC’s plan assumptions. Loss Contingencies [Line Items] Loss Contingencies [Line Items] Fixed assets, net Property, Plant and Equipment, Net Primary Geographical Markets [Axis] Primary Geographical Markets [Axis] Primary Geographical Markets [Axis] Carrier [Member] Carrier [Member] Carrier [Member] Current Year Actions [Member] Current Year Actions [Member] Activity related to restructuring programs or actions approved in the current year Long-term debt, including current portion Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Other long-term liabilities Other Liabilities, Noncurrent Contract liability write-off related a contract termination Contract liability write-off related a contract termination Contract liability write-off related a contract termination Other Income [Member] Other Income [Member] Amortization of acquired Raytheon Company intangible assets, net (1) Pro Forma Nonrecurring Adjustment, Amortization of acquired Raytheon Company intangible assets, net Reflects the additional amortization of the acquired Raytheon Company intangible assets recognized at fair value in purchase accounting and eliminates the historical Raytheon Company intangible asset amortization expense. Schedule of Long-term Debt [Table Text Block] Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Notes 3.150% Due 2024 Notes 3.150% Due 2024 [Member] Notes 3.150% Due 2024 Repayment of long-term debt Repayments of Long-term Debt Earnings Per Share [Abstract] Earnings Per Share [Abstract] Income (loss) from discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Derivative assets Derivative Asset Net sales Business Acquisition, Pro Forma Revenue Fixed assets Property, Plant and Equipment, Gross Allowance for expected credit losses Balance as of January 1 Balance as of June 30 Accounts Receivable, Allowance for Credit Loss Contract assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contract Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contract Assets Other Financing Arrangements [Member] Other Financing Arrangements [Member] Other Financing Arrangements Document Quarterly Report Document Quarterly Report Other current assets Increase (Decrease) in Other Operating Assets Net sales Revenues Revenues Basis of Presentation [Table] Basis of Presentation [Table] Basis of Presentation [Table] Trademarks Trademarks [Member] Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Other, net(2) Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Line of Credit Facility [Table] Line of Credit Facility [Table] Notes 4.700% Due 2041 Notes 4.700% Due 2041 [Member] Notes 4.700% Due 2041 Notes 4.875% Due 2020 [Member] Notes 4.875% Due 2020 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Schedule of Noncash or Part Noncash Acquisitions Schedule of Noncash or Part Noncash Acquisitions [Table Text Block] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Costs and Expenses: Costs and Expenses [Abstract] International Aero Engines LLC [Member] International Aero Engines LLC [Member] International Aero Engines LLC [Member] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Europe [Member] Europe [Member] Notes 3.362% Due 2050 Notes 3.362% Due 2050 [Member] Notes 3.362% Due 2050 Notes 4.625% Due 2048 [Member] Notes 4.625% Due 2048 [Member] Notes 4.625% Due 2048 [Member] Adjustment related to the Distributions Stockholders' Equity Note, Spinoff Transaction Document Fiscal Period Focus Document Fiscal Period Focus Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Carrier [Member] UTC Climate, Controls and Security [Member] Factored receivables [Member] Factored receivables [Member] Factored receivables Aggregate Line of Credit Agreements, Maximum Borrowing Capacity Aggregate Line of Credit Facility Maximum Borrowing Capacity Net income (loss) from continuing and discontinued operations Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Total principal long-term debt Principal Long-Term Debt Including both current and noncurrent portions, carrying amount as of the balance-sheet date principal debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. Unfavorable EAC adjustment related to military contracts Unfavorable EAC adjustment related to military contracts Unfavorable EAC adjustment related to military contracts Inventory Valuation Reserves Inventory Valuation Reserves Total liabilities acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current COVID-19 [Member] COVID-19 [Member] COVID-19 UNITED STATES UNITED STATES Maximum Potential Payment Guarantor Obligations, Maximum Exposure, Undiscounted Variable Interest Entity Disclosure Variable Interest Entity Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Other financing activities, net Proceeds from (Payments for) Other Financing Activities Gross Amount Finite-Lived Intangible Assets, Gross Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Loss Contracts Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Loss Contracts Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Loss Contracts Entity Central Index Key Entity Central Index Key Security Exchange Name Security Exchange Name Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Amounts reclassified, pre-tax Reclassification from AOCI, Current Period, before Tax, Attributable to Parent Disposal Group Classification [Domain] Disposal Group Classification [Domain] Income (loss) from discontinued operations attributable to common shareowners Income (loss) from discontinued operations attributable to common shareowners Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Notes 7.500% Due 2029 [Member] Notes 7.500% Due 2029 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block] Other Comprehensive Income (Loss), Foreign Currency Transaction, Effect of Separation of Otis and Carrier Other Comprehensive Income (Loss), Foreign Currency Transaction, Effect of Separation of Otis and Carrier Other Comprehensive Income (Loss), Foreign Currency Transaction, Effect of Separation of Otis and Carrier Diluted weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Diluted Utilization of contractual customer obligation (3) Pro Forma Nonrecurring Adjustment, Utilization of contractual customer obligation Reflects the additional amortization of liabilities recognized for acquired contracts with terms less favorable than could be realized in market transactions as of the acquisition date and eliminates Rockwell Collins historical amortization of these liabilities. Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Other income (expense), net Disposal Group, Including Discontinued Operation, Other Income Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Eliminations and other [Member] Eliminations and other [Member] Segment member representing both Corporate functions and intersegment eliminations Current Fiscal Year End Date Current Fiscal Year End Date Write-offs charged against the allowance for expected credit losses Accounts Receivable, Allowance for Credit Loss, Writeoff Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Unrealized hedging (losses) gains Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Measurement Basis [Axis] Measurement Basis [Axis] Notes 3.750% Due 2046 [Member] Notes 3.750% Due 2046 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Amortization Expense, 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Five 5.0B Revolving Credit Agreement [Member] Revolving Credit Agreement [Member] Revolving credit facility available as of the balance-sheet date. Accrued Liabilities Accrued Liabilities Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Operating lease liabilities, non-current portion Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation Libor plus 0.45% floating rates due 2023 Libor plus 0.45% floating rates due 2023 [Member] Libor plus 0.45% floating rates due 2023 Restructuring And Related Costs Actions By Year [Domain] Restructuring And Related Costs Actions By Year [Domain] Identification of the time periods of restructuring and related activities Credit Facility [Axis] Credit Facility [Axis] Amortized: [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Change in: Increase (Decrease) in Operating Capital [Abstract] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Notes 3.200% Due 2024 [Member] Notes 3.200% Due 2024 [Member] Notes 3.200% Due 2024 [Member] Contract with Customer, Liability, Change Contract with Customer, Liability, Change Contract with Customer, Liability, Change Other assets, current Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Notes 3.377% Due 2040 Notes 3.377% Due 2040 [Member] Notes 3.377% Due 2040 Schedule of Short-Term Debt [Table Text Block] Schedule of Short-term Debt [Table Text Block] Notes 1.250% due 2023 [Member] Notes 1.250% due 2023 [Member] Debt security issued by a foreign corporate business entity with a promise of repayment. Notes 7.000% Due 2038 [Member] Notes 7.000% Due 2038 [Member] Debt security issued by a domestic corporate business entity with a promise of repayment. Total Current Liabilities Liabilities, Current Liabilities, Current Notes 3.350% Due 2021 [Member] Notes 3.350% due 2021 [Member] Notes 3.350% due 2021 [Member] Class of Stock [Domain] Class of Stock [Domain] Intersegment Eliminations Intersegment Eliminations [Member] Tax benefit (expense) - Foreign Currency Translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax U.S. Government Sales Excluding Foreign Military Sales Member U.S. Government Sales Excluding Foreign Military Sales Member [Member] U.S. Government Sales Excluding Foreign Military Sales Member Gain recognized in Other income, net Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Loss Contingencies [Table] Loss Contingencies [Table] Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Adjustment to interest expense related to the Raytheon Merger, net (7) Pro Forma Nonrecurring Adjustment, Interest expense related to debt distributions and Raytheon Merger, net Pro Forma Nonrecurring Adjustment, Interest expense related to debt distributions and Raytheon Merger, net Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Other accrued liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Liabilities Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Cash, cash equivalents and restricted cash within assets related to discontinued operations, beginning of period Less: Cash, cash equivalents and restricted cash for discontinued operations Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations Net cash flows provided by operating activities from continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Long-term debt (excluding finance leases) Long-term debt (excluding capitalized leases) Fair Value Disclosure This element is used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of long-term borrowings (excluding capitalized leases). Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Notes 2.650% Due 2026 [Member] Notes 2.650% Due 2026 [Member] Debt security issued by a foreign corporate business entity with a promise of repayment. Derivatives designated as hedging instruments, Liability Derivatives Foreign Currency Cash Flow Hedge Liability at Fair Value Loss Contingency, Interest Loss Contingency, Interest Interest associated with damages sought in legal matter. Significant Change In Unrecognized Tax Benefits Is Reasonably Possible [Line Items] Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Accrued employee compensation Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Employee Compensation Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Employee Compensation Marketable Securities Marketable Securities [Table Text Block] Proceeds from Common Stock issued under employee stock plans Proceeds from Stock Plans Other assets, current Other Assets, Current Statement [Table] Statement [Table] Revised Segment Financial Results Revised Segment Financial Results [Table Text Block] Tabular disclosure of the revised profit and loss for each reportable segment after reorganization of certain product areas Business Acquisition UTC stock payable shares Business Acquisition UTC stock payable shares Business Acquisition UTC stock payable shares RPO to be recognized within 12 months Revenue, Remaining Performance Obligations, to be recognized within 12 months Revenue, Remaining Performance Obligations, to be recognized within 12 months Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies Shares of RTC common stock issued for Raytheon Company outstanding common stock and vested equity awards Shares of RTC common stock issued for Raytheon Company outstanding common stock and vested equity awards Shares of RTC common stock issued for Raytheon Company outstanding common stock and vested equity awards Schedule of Weighted average interest rates [Table Text Block] Schedule of Weighted average interest rates [Table Text Block] [Table Text Block] for Schedule of weighted-average interest rates for short-term borrowings and total debt. Percentages are categorized by average outstanding borrowings during the year and outstanding borrowings as of the end of the year. 2018 U.S. Defense Contract Management Agency Claim Against Pratt & Whitney [Member] U.S. Defense Contract Management Agency Claim Against Pratt & Whitney - second claim [Member] U.S. Defense Contract Management Agency Claim Against Pratt & Whitney - second claim [Member] Income Tax Uncertainties [Abstract] Income Tax Uncertainties [Abstract] Basis of Presentation [Line Items] Basis of Presentation [Line Items] Basis of Presentation [Line Items] Statistical Measurement [Axis] Statistical Measurement [Axis] Cash, cash equivalents and restricted cash, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations $2.0B May 6, 2020 revolving credit agreement [Member] $2.0B May 6, 2020 revolving credit agreement [Member] $2.0B May 6, 2020 revolving credit agreement Loss from discontinued operations, before tax Income (loss) from discontinued operations, before tax Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Goodwill Goodwill - Beginning Balance Goodwill - Ending Balance Goodwill Extinguishment of Debt, Amount Extinguishment of Debt, Amount Statement Business Segments Axis [Domain] Statement Business Segments Axis [Domain] Statement Business Segments Axis [Domain] Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Depreciation and amortization Depreciation, Amortization and Accretion, Net Cost of Sales [Member] Cost of Sales [Member] Net income (loss) from continuing operations Net income (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Tax benefit (expense) - Pension Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax Scenario [Domain] Scenario [Domain] Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table Text Block] Adjustments to reconcile net income (loss) from continuing operations to net cash flows provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Pension Plan [Member] Pension Plan [Member] Fair value of RTC common stock issued for Raytheon Company outstanding common stock and vested equity awards Fair value of RTC common stock issued for Raytheon Company outstanding common stock and vested equity awards Fair value of RTC common stock issued for Raytheon Company outstanding common stock and vested equity awards Notes 1.923% Due 2023 Notes 1.923% Due 2023 [Member] Notes 1.923% Due 2023 Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Developed technology and other Developed Technology Rights [Member] Variable Interest Entity, Qualitative of Quantitative Information, Net Percentage Variable Interest Entity, Qualitative of Quantitative Information, Net Percentage Net percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity. Defined Benefit Pension and Post-retirement Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Deferred income tax provision Deferred Income Tax Expense (Benefit) Notes 1.150% Due 2024 [Member] Notes 1.150% Due 2024 [Member] Notes 1.150% Due 2024 [Member] Discontinued Operations: Net Cash Provided by (Used in) Discontinued Operations [Abstract]