CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 111	$ 194	$ 142	$ 526
Other comprehensive income (loss)
Foreign currency translation adjustments	[1]	49	(114)	(11)	(136)
Hedge instruments	[1]	1	1	0	0
Defined benefit postretirement plans	[1]	7	4	8	31
Total other comprehensive income (loss) attributable to BorgWarner Inc.		57	(109)	(3)	(105)
Comprehensive income attributable to BorgWarner Inc.	[1]	168	85	139	421
Net earnings attributable to the noncontrolling interest, net of tax		18	13	40	34
Other comprehensive income (loss) attributable to the noncontrolling interest*	[1]	6	(5)	3	(7)
Comprehensive income		$ 192	$ 93	$ 182	$ 448

[1] Net of income taxes.