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Acquisitions, Dispositions, Goodwill and Intangible Assets (General Information) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 08, 2021 | Apr. 03, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 54,265 |  | $ 54,285
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  | 1,049 | $ 0 |
Assets |  |  | 160,608 |  | 162,153
Liabilities |  |  | 87,266 |  | 88,269
Forcepoint |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates | $ 1,000 |  |  |  |
Forcepoint | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Assets |  |  |  |  | 1,900
Liabilities |  |  |  |  | 855
Goodwill and intangible assets |  |  |  |  | $ 1,400
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 |  |  |
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 |  |  |
Fair value attributable to pre-merger service for replacement equity awards |  | 99 |  |  |
Total estimated merger consideration |  | $ 33,166 |  |  |
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 |  |  |
Goodwill, Purchase Accounting Adjustments |  |  | 61 |  |
Cash and cash equivalents |  | $ 3,208 |  |  |
Accounts receivable |  | 1,997 |  |  |
Inventory |  | 705 |  |  |
Contract assets |  | 6,023 |  |  |
Other assets, current |  | 940 |  |  |
Fixed assets |  | 4,745 |  |  |
Operating lease right-of-use assets |  | 950 |  |  |
Intangible assets: |  | 19,130 |  |  |
Other assets |  | 1,218 |  |  |
Total identifiable assets acquired |  | 38,916 |  |  |
Accounts payable |  | 1,477 |  |  |
Accrued employee compensation |  | 1,492 |  |  |
Other accrued liabilities |  | 1,921 |  |  |
Contract liabilities |  | 3,002 |  |  |
Long-term debt, including current portion |  | 4,700 |  |  |
Operating lease liabilities, non-current portion |  | 738 |  |  |
Future pension and postretirement benefit obligation |  | 11,607 |  |  |
Other long-term liabilities |  | 2,368 |  |  |
Total liabilities acquired |  | 27,305 |  |  |
Total identifiable net assets |  | 11,611 |  |  |
Goodwill |  | 21,589 |  |  |
Redeemable noncontrolling interest |  | (34) |  |  |
Total consideration transferred |  | 33,166 |  |  |
Fair value adjustments to fixed assets |  | 1,100 |  |  |
Fair value adjustment to future pension and postretirement benefit obligations |  | 3,600 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Loss Contracts |  | 222 |  |  |
Business Combination, Acquisition Related Costs |  |  | $ 17 | 29 |
Net sales |  |  |  | 18,451 |
Income from continuing operations attributable to common shareowners |  |  |  | $ 1,239 |
Basic earnings per share of common stock from continuing operations |  |  |  | $ 0.82 |
Diluted earnings per share of common stock from continuing operations |  |  |  | $ 0.82 |
Amortization of acquired Raytheon Company intangible assets, net (1) |  |  |  | $ (270) |
Amortization of fixed asset fair value adjustment (2) |  |  |  | (9) |
Utilization of contractual customer obligation (3) |  |  |  | 8 |
Deferred revenue fair value adjustment (4) |  |  |  | (4) |
Adjustment to non-service pension (income) expense (5) |  |  |  | 239 |
RTC/Raytheon fees for advisory, legal, accounting services (6) |  |  |  | 35 |
Adjustment to interest expense related to the Raytheon Merger, net (7) |  |  |  | 9 |
Elimination of deferred commission amortization (8) |  |  |  | 5 |
Pro Forma Nonrecurring Adjustments, Net |  |  |  | $ 13 |
Raytheon Company [Member] | Customer Relationships [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-Lived Intangibles |  | $ 12,900 |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 25 years |  |  |
Raytheon Company [Member] | Trademarks |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-Lived Intangibles |  | $ 5,430 |  |  |
Raytheon Company [Member] | Developed technology and other |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-Lived Intangibles |  | $ 800 |  |  |
Raytheon Company [Member] | Developed technology and other | Maximum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 7 years |  |  |
Raytheon Company [Member] | Developed technology and other | Minimum [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 5 years |  |  |

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