Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 160	$ 225
Other comprehensive income (loss)
Foreign currency translation adjustments	[1]	(9)	65
Hedge instruments	[1]	0	(3)
Defined benefit postretirement plans	[1]	8	(2)
Total other comprehensive (loss) income attributable to BorgWarner Inc.		(1)	60
Comprehensive income attributable to BorgWarner Inc.	[1]	159	285
Net earnings attributable to the noncontrolling interest, net of tax		11	12
Other comprehensive income attributable to the noncontrolling interest	[1]	1	2
Comprehensive income		$ 171	$ 299

[1] Net of income taxes.