Condensed Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period Of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Accumulated Deficit	UTC Net (Deficit) Investment	UTC Net (Deficit) Investment Cumulative Effect, Period Of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Total Shareholders' (Deficit) Equity	Total Shareholders' (Deficit) Equity Cumulative Effect, Period Of Adoption, Adjustment	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018			0
Beginning balance at Dec. 31, 2018	$ 2,106		$ 0	$ 0	$ 0	$ 2,277		$ (708)	$ 1,569		$ 537
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net transfers to UTC and Separation-related transactions	(568)					(568)			(568)
Net income	1,013					898			898		115
Redeemable noncontrolling interest in subsidiaries' earnings	7										7
Other comprehensive income (loss), net of tax	(116)							(105)	(105)		(11)
Purchase of subsidiary shares from noncontrolling interest	3										3
Dividends attributable to noncontrolling interest	(129)										(129)
Acquisitions, disposals and other changes in noncontrolling interest	6										6
Ending balance (in shares) at Sep. 30, 2019			0
Ending balance at Sep. 30, 2019	2,316		$ 0	0	0	2,607		(813)	1,794		522
Beginning balance at Dec. 31, 2018	109
Redeemable Noncontrolling Interest
Redeemable noncontrolling interest in subsidiaries' earnings	(7)
Other comprehensive income (loss), net of tax	(2)
Changes in redeemable noncontrolling interest redemption value	7
Ending balance at Sep. 30, 2019	107
Beginning balance (in shares) at Jun. 30, 2019			0
Beginning balance at Jun. 30, 2019	2,324		$ 0	0	0	2,545		(734)	1,811		513
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net transfers to UTC and Separation-related transactions	(255)					(255)			(255)
Net income	361					317			317		44
Redeemable noncontrolling interest in subsidiaries' earnings	1										1
Other comprehensive income (loss), net of tax	(92)							(79)	(79)		(13)
Purchase of subsidiary shares from noncontrolling interest	2										2
Dividends attributable to noncontrolling interest	(23)										(23)
Acquisitions, disposals and other changes in noncontrolling interest	2										2
Ending balance (in shares) at Sep. 30, 2019			0
Ending balance at Sep. 30, 2019	2,316		$ 0	0	0	2,607		(813)	1,794		522
Beginning balance at Jun. 30, 2019	109
Redeemable Noncontrolling Interest
Redeemable noncontrolling interest in subsidiaries' earnings	(1)
Changes in redeemable noncontrolling interest redemption value	(1)
Ending balance at Sep. 30, 2019	107
Beginning balance (in shares) at Dec. 31, 2019			0
Beginning balance at Dec. 31, 2019	2,231	$ (25)	$ 0	0	0	2,458	$ (25)	(758)	1,700	$ (25)	531
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net transfers to UTC and Separation-related transactions	(6,150)					(6,150)			(6,150)
Issuance of common stock and reclassification of deficit (in shares)			433
Issuance of common stock and reclassification of deficit			$ 4
Reclassification of deficit					(3,556)	3,552
Net income	777				490	165			655		122
Stock-based compensation	32			32					32
Other comprehensive income (loss), net of tax	(40)							(61)	(61)		21
Cash dividends declared ($0.20 per common share)	(173)				(173)				(173)
Dividends attributable to noncontrolling interest	(123)										(123)
Acquisitions, disposals and other changes in noncontrolling interest	(4)				4				4		(8)
Changes in redeemable noncontrolling interest redemption value	(6)				(6)				(6)
Ending balance (in shares) at Sep. 30, 2020			433
Ending balance at Sep. 30, 2020	(3,481)		$ 4	32	(3,241)	0		(819)	(4,024)		543
Beginning balance at Dec. 31, 2019	95
Redeemable Noncontrolling Interest
Other comprehensive income (loss), net of tax	(4)
Changes in redeemable noncontrolling interest redemption value	7
Ending balance at Sep. 30, 2020	98
Beginning balance (in shares) at Jun. 30, 2020			433
Beginning balance at Jun. 30, 2020	(3,672)		$ 4	15	(3,418)	0		(843)	(4,242)		570
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	310				266				266		44
Stock-based compensation	17			17					17
Other comprehensive income (loss), net of tax	38							24	24		14
Cash dividends declared ($0.20 per common share)	(86)				(86)				(86)
Dividends attributable to noncontrolling interest	(84)										(84)
Acquisitions, disposals and other changes in noncontrolling interest	(1)										(1)
Changes in redeemable noncontrolling interest redemption value	(3)				(3)				(3)
Ending balance (in shares) at Sep. 30, 2020			433
Ending balance at Sep. 30, 2020	(3,481)		$ 4	$ 32	$ (3,241)	$ 0		$ (819)	$ (4,024)		$ 543
Beginning balance at Jun. 30, 2020	96
Redeemable Noncontrolling Interest
Other comprehensive income (loss), net of tax	(1)
Changes in redeemable noncontrolling interest redemption value	3
Ending balance at Sep. 30, 2020	$ 98