Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Uncertainties [Abstract]
Balance at January 1		$ 1,458	$ 1,225	$ 1,347
Additions for tax positions related to the current year		106	110	125
Additions for tax positions of prior years		23	282	323
Reductions for tax positions of prior years		(56)	(49)	(83)
Settlements		(16)	(110)	(48)
Separation of Carrier and Otis	$ (439)	0	0	(439)
Balance at December 31		1,515	1,458	1,225
Gross interest expense related to unrecognized tax benefits		34	39	50
Total accrued interest balance at December 31	$ 165	$ 190	$ 165	$ 141