Accumulated Other Comprehensive Loss (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (1,005)	$ 49	$ 710	$ (3,211)
Other comprehensive (loss) income, net - Foreign Currency Translation	(1,050)	(647)	609
Amounts reclassified, pretax - Foreign Currency Translation	2	0	0
Tax benefit (expense)	(6)	(14)	25
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Impact of Separation of Carrier and Otis, net of Tax			3,287
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(782)	(1,828)	(4,483)	(6,772)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	1,225	3,210	1,842
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	129	258	373
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(308)	(813)	(510)
Other Comprehensive Income (Loss), Defined Benefit Plan, Impact of Separation of Carrier and Otis, net of Tax			584
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax	(231)	(136)	39	(166)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(246)	(226)	181
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	103	(28)	82
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	48	79	(62)
Other Comprehensive Income (Loss), Cash Flow Hedge, Impact of Separation of Carrier and Otis, net of Tax			4
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,018)	(1,915)	(3,734)	$ (10,149)
Other comprehensive (loss) income before reclassifications, net	(71)	2,337	2,632
Amounts reclassified, pretax	234	230	455
Other Comprehensive Income (Loss), Tax	$ 266	$ 748	547
Other Comprehensive Income (Loss), Impact of Separation of Carrier and Otis, net of Tax			$ 3,875