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Basis of Presentation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Goodwill Impairment Loss | $ 0 | $ 0 |  |  |  | $ 0 | $ 3,183
Estimated Credit Losses |  | 48 |  |  |  |  | 357
Collins Aerospace Systems [Member] | Patents and trademarks [Member] |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | $ 57 |  |
Pratt & Whitney [Member] |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Unfavorable EAC adjustment related to military contracts |  |  | $ 44 |  |  |  |
Collins Aerospace Systems [Member] |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Goodwill Impairment Loss |  |  | $ 3,200 |  |  |  |
Contract Asset And Inventory Write Offs |  | 13 |  |  |  |  | 146
Pratt & Whitney [Member] |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |
Unfavorable EAC adjustment related to the restructuring of a customer contract |  | 129 |  |  |  |  | 129
Asset Impairment Charges |  | $ 89 |  |  |  |  | 89
Unfavorable EAC adjustment on a commercial engine aftermarket contract |  |  |  |  |  |  | $ 334
Unfavorable EAC adjustments on commercial aftermarket contracts |  |  |  | $ 48 |  |  |

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