Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 129		$ 160
Other comprehensive income (loss)
Foreign currency translation adjustments		(74)	[1]	(9)
Hedge instruments		(2)	[1]	0
Defined benefit postretirement plans		2	[1]	8
Total other comprehensive loss attributable to BorgWarner Inc.		(74)		(1)
Comprehensive income attributable to BorgWarner Inc.	[1]	55		159
Net earnings attributable to the noncontrolling interest, net of tax		8		11
Other comprehensive (loss) income attributable to the noncontrolling interest	[1]	(3)		1
Comprehensive income		$ 60		$ 171

[1] Net of income taxes.