Goodwill and Intangible Assets (Goodwill) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Line Items]
Goodwill - Beginning Balance	$ 53,699
Goodwill - Acquisitions and Divestitures	0
Goodwill, Foreign Currency Translation and Other	(55)
Goodwill - Ending Balance	53,644
Collins Aerospace [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	33,135
Goodwill - Acquisitions and Divestitures	0
Goodwill, Foreign Currency Translation and Other	(57)
Goodwill - Ending Balance	33,078
Pratt & Whitney [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	1,563
Goodwill - Acquisitions and Divestitures	0
Goodwill, Foreign Currency Translation and Other	0
Goodwill - Ending Balance	1,563
Raytheon
Goodwill [Line Items]
Goodwill - Beginning Balance	18,984
Goodwill - Acquisitions and Divestitures	0
Goodwill, Foreign Currency Translation and Other	2
Goodwill - Ending Balance	18,986
Total Segments [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	53,682
Goodwill - Acquisitions and Divestitures	0
Goodwill, Foreign Currency Translation and Other	(55)
Goodwill - Ending Balance	53,627
Eliminations and other [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	17
Goodwill - Acquisitions and Divestitures	0
Goodwill, Foreign Currency Translation and Other	0
Goodwill - Ending Balance	$ 17