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Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Basis of Presentation [Line Items]
Goodwill Impairment Loss	$ 0	$ 3,183	$ 0	$ 3,183
Estimated Credit Losses		237		309
Collins Aerospace Systems [Member] | Patents and trademarks [Member]
Basis of Presentation [Line Items]
Asset Impairment Charges		17		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		122		$ 133
Pratt & Whitney [Member]
Basis of Presentation [Line Items]
Unfavorable EAC adjustment related to the restructuring of a customer contract		$ 57

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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