Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 194	$ 204	$ 526	$ 701
Other comprehensive (loss) income
Foreign currency translation adjustments	[1]	(114)	(43)	(136)	(124)
Hedge instruments	[1]	1	2	0	0
Defined benefit retirement plans	[1]	4	0	31	5
Total other comprehensive loss attributable to BorgWarner Inc.		(109)	(41)	(105)	(119)
Comprehensive income attributable to BorgWarner Inc.	[1]	85	163	421	582
Net earnings attributable to the noncontrolling interest, net of tax		13	12	34	36
Other comprehensive loss attributable to the noncontrolling interest	[1]	(5)	(3)	(7)	(7)
Comprehensive income		$ 93	$ 172	$ 448	$ 611

[1] Net of income taxes.