Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 39,043	$ 39,043	$ 25,935
Accumulated Amortization	5,727	5,727	4,838
Unamortized: Trademarks and Other	8,687	8,687	3,376
Total Intangible Assets Gross Excluding Goodwill	47,730	47,730	29,311
Collins Aerospace Systems [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)	17	57
Intangible assets, amount of fair value in excess of carrying amount	$ 70	$ 70
Intangible assets, percentage of fair value in excess of carrying amount	4.00%	4.00%
Patents and trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 47	$ 47	47
Accumulated Amortization	34	34	34
Collaboration intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	4,948	4,948	4,862
Accumulated Amortization	997	997	920
Customer relationships and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	29,938	29,938	17,750
Accumulated Amortization	4,134	4,134	3,392
Developed Technology Rights
Finite-Lived Intangible Assets [Line Items]
Gross Amount	1,685	1,685	890
Accumulated Amortization	288	288	217
Exclusivity assets
Finite-Lived Intangible Assets [Line Items]
Gross Amount	2,425	2,425	2,386
Accumulated Amortization	$ 274	$ 274	$ 275