CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (UNAUDITED) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings		$ (98)	$ 172	$ 31	$ 332
Other comprehensive income (loss)
Foreign currency translation adjustments	[1]	14	(13)	(60)	(22)
Hedge instruments	[1]	1	(1)	(1)	(1)
Defined benefit postretirement plans	[1]	(1)	19	1	27
Total other comprehensive income (loss) attributable to BorgWarner Inc.		14	5	(60)	4
Comprehensive (loss) income attributable to BorgWarner Inc.	[1]	(84)	177	(29)	336
Net earnings attributable to the noncontrolling interest, net of tax		14	10	22	21
Other comprehensive loss attributable to the noncontrolling interest*	[1]	0	(3)	(3)	(2)
Comprehensive (loss) income		$ (70)	$ 184	$ (10)	$ 355

[1] Net of income taxes.