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