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Business Combinations (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 03, 2020 | Dec. 31, 2021 | Nov. 30, 2021 | Jan. 31, 2021 | Dec. 31, 2020 | May 31, 2020 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Cost Of Acquired Entities and Interest in Affiliates |  |  |  |  |  |  |  |  |  | $ 66 | $ 1,100 | $ 35,100
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 1,100 |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  | 800 |  |  |  |  |  |  | 31 |  |
Finite-lived Intangible Assets Acquired |  |  | $ 300 |  |  |  |  |  |  |  |  |
Defined benefit plan, benefit obligation, (increase) decrease due to remeasurement | $ 2,400 |  |  |  |  |  |  |  |  |  |  |
Customer Contractual Obligation |  | $ 929 |  |  |  |  |  |  |  | 818 | 929 |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  | 900 |  |  |  |  |  |  |  | 94 | 1,879 | 2,556
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  | 251 |  |  |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, After Tax |  | 135 |  |  |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Non-Service Pension (Income) Expense |  | $ 12 |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | $ 3,200 | 0 | 0 | 3,183
Amortization of Intangible Assets |  |  |  |  |  |  |  |  |  | 1,957 | 2,439 | 2,125
Collins Aerospace Military Global Positioning System G P S And Space Based Precision Optics Businesses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
Costs related to the divestitures required for regulatory approval |  |  |  |  |  |  |  | 20 |  |  |  |
Collins Aerospace Military Global Positioning System G P S And Space Based Precision Optics Businesses [Member] | Other Income (Expense) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  |  | 608 |  |  |  |
Collins Aerospace Military Global Positioning System G P S 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 |  |  |  |  |  |
Forcepoint [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses and Interests in Affiliates |  |  |  | $ 1,100 |  |  |  |  |  |  |  |
Collins Aerospace Systems [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  |  |  | $ (36) |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  | $ 3,200 |  |  | 3,200
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  |  |  |  |  |  |  |  |  | 57
Raytheon Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period | $ 21,600 |  |  |  |  |  |  |  |  |  |  |
Agreed Upon Number Shares of Common Stock of UTC which each share of Raytheon Common Stock will be Converted Into | 2.3348 |  |  |  |  |  |  |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  | $ 61 |  |  |  |  |
Fair value adjustments to fixed assets | $ 1,100 |  |  |  |  |  |  |  |  |  |  |
Fair value adjustment to future pension and postretirement benefit obligations | 3,600 |  |  |  |  |  |  |  |  |  |  |
Customer Contractual Obligation | $ 222 |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  | $ 17 | $ 142
Blue Canyon [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | $ 425 |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  | 281 |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  | $ 149 |  |  |  |  |  |  |

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