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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (General Information) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 03, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of RTC common stock issued for Raytheon Company outstanding common stock and vested equity awards | $ 33,067 |  |  |  |  |
Fair value attributable to pre-merger service for replacement equity awards | 99 |  |  |  |  |
Total estimated merger consideration | $ 33,166 |  |  |  |  |
Goodwill |  | $ 53,524 |  | $ 53,524 |  | $ 36,609
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | 2,575 | $ 134 |
Collins Aerospace military Global Positioning System (GPS) and space-based precision optics businesses [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Costs related to the divestitures required for regulatory approval |  | 20 |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  | 2,300 |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  | 580 |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, After Tax |  | 253 |  |  |  |
Income (Loss) from Individually Significant Component Disposed of or Held-for-sale, Excluding Discontinued Operations, before Income Tax |  |  |  | 94 |  | $ 153
Collins Aerospace military Global Positioning System (GPS) and space-based precision optics businesses [Member] | Other Operating Income (Expense) [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  | 608 |  |  |  |
Collins Aerospace military Global Positioning System (GPS) and space-based precision optics businesses [Member] | Nonoperating Income (Expense) |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  | 8 |  |  |  |
Airborne Tactical Radios Business [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | 231 |  |
Gain on disposal recorded as an adjustment to fair value of net asset acquired |  |  |  | $ 199 |  |
Carrier [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Shares of common stock distributed in the Distribution | 866,158,910 |  |  |  |  |
Otis [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Shares of common stock distributed in the Distribution | 433,079,455 |  |  |  |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 32 years |  |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 1 year |  |
Developed Technology Rights | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 25 years |  |
Developed Technology Rights | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 5 years |  |
Raytheon Company [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition UTC stock payable shares | 2.3348 |  |  |  |  |
Fair value of RTC common stock issued for Raytheon Company outstanding common stock and vested equity awards | $ 33,067 |  |  |  |  |
Common Stock, Shares, Outstanding | 277,300,000 |  |  |  |  |
Stock awards vested as a result of the Raytheon Merger | 400,000 |  |  |  |  |
Total outstanding shares entitled to merger consideration | 277,700,000 |  |  |  |  |
Shares of RTC common stock issued for Raytheon Company outstanding common stock and vested equity awards | 648,400,000 |  |  |  |  |
Price per share of RTC common stock | $ 51.00 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | $ 3,208 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 1,997 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 705 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contract Assets | 6,023 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other | 930 |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | 14 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 4,732 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 19,130 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 2,139 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 38,878 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 1,455 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accrued Liabilities | 3,237 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Contract Liabilities | 2,991 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | 4,700 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Pension and Postretirement Liabilities | 10,641 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 3,455 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 26,479 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 12,399 |  |  |  |  |
Goodwill | 20,801 |  |  |  |  |
Business Combination, Acquisition of Noncontrolling Interest, Fair Value | (34) |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 33,166 |  |  |  |  |
Fair value adjustments to fixed assets | 1,100 |  |  |  |  |
Fair value adjustment to future pension and postretirement benefit obligations | 2,600 |  |  |  |  |
Business Combination, Acquisition Related Costs |  | 26 |  | $ 125 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Loss Contracts | 218 |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  | 14,747 | $ 18,752 | 47,668 | 54,790 |
Business Acquisition, Pro Forma Net Income (Loss) |  | $ 174 | $ 1,817 | $ (2,328) | $ 5,065 |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic |  | $ 0.12 | $ 1.20 | $ (1.54) | $ 3.36 |
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Diluted |  | $ 0.11 | $ 1.20 | $ (1.54) | $ 3.34 |
Amortization of acquired Raytheon Company intangible assets, net (1) |  | $ 0 | $ (261) | $ (270) | $ (787) |
Amortization of fixed asset fair value adjustment (2) |  | 0 | (9) | (9) | (28) |
Utilization of contractual customer obligation (3) |  | 0 | 15 | 8 | 44 |
Deferred revenue fair value adjustment (4) |  | 0 | (8) | (4) | (25) |
Adjustment to non-service pension (income) expense (5) |  | 0 | 208 | 239 | 623 |
RTC/Raytheon fees for advisory, legal, accounting services (6) |  | 23 | 38 | 119 | (119) |
Adjustment to interest expense related to the Raytheon Merger, net (7) |  | 0 | 9 | 9 | 27 |
Elimination of deferred commission amortization (8) |  | 0 | 5 | 5 | 15 |
Pro Forma Nonrecurring Adjustments, Net |  | $ 23 | $ (3) | $ 97 | $ (250) |
Raytheon Company [Member] | Customer Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 12,900 |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 25 years |  |  |  |  |
Raytheon Company [Member] | Trademarks |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 5,430 |  |  |  |  |
Raytheon Company [Member] | Developed Technology Rights |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 800 |  |  |  |  |
Raytheon Company [Member] | Developed Technology Rights | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 7 years |  |  |  |  |
Raytheon Company [Member] | Developed Technology Rights | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |  |  |  |

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