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Acquisitions, Dispositions, Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount |  | $ 38,841 | $ 38,757
Accumulated Amortization |  | (7,551) | (6,932)
Unamortized: Trademarks and Other |  | 8,709 | 8,714
Total Intangible Assets Gross Excluding Goodwill |  | 47,550 | 47,471
Collins Aerospace Systems [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ 40 |  |
Patents and trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount |  | 48 | 48
Accumulated Amortization |  | (36) | (35)
Collaboration assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount |  | 5,047 | 5,021
Accumulated Amortization |  | (1,042) | (1,024)
Exclusivity assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount |  | 2,581 | 2,541
Accumulated Amortization |  | (305) | (295)
Developed technology and other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount |  | 928 | 906
Accumulated Amortization |  | (364) | (316)
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount |  | 30,237 | 30,241
Accumulated Amortization |  | $ (5,804) | $ (5,262)

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