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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross Amount |  |  | $ 39,203 | $ 25,935
Accumulated Amortization |  |  | 6,349 | 4,838
Unamortized: Trademarks and Other |  |  | 8,710 | 3,376
Total Intangible Assets Gross Excluding Goodwill |  |  | 47,913 | 29,311
Collins Aerospace Systems [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ 17 | $ 40 |  |
Intangible assets, amount of fair value in excess of carrying amount |  |  | $ 70 |
Intangible assets, percentage of fair value in excess of carrying amount |  |  | 4.00% |
Patents and trademarks [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross Amount |  |  | $ 47 | 47
Accumulated Amortization |  |  | 34 | 34
Collaboration intangible assets [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross Amount |  |  | 4,982 | 4,862
Accumulated Amortization |  |  | 1,001 | 920
Customer relationships and other [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross Amount |  |  | 30,007 | 17,750
Accumulated Amortization |  |  | 4,694 | 3,392
Developed Technology Rights |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross Amount |  |  | 1,691 | 890
Accumulated Amortization |  |  | 339 | 217
Exclusivity assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross Amount |  |  | 2,476 | 2,386
Accumulated Amortization |  |  | $ 281 | $ 275

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