Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings attributable to BorgWarner Inc.		$ 172	$ 272	$ 332	$ 497
Other comprehensive income (loss)
Foreign currency translation adjustments	[1]	(13)	(146)	(22)	(81)
Hedge instruments	[1]	(1)	1	(1)	(2)
Defined benefit retirement plans	[1]	19	7	27	5
Total other comprehensive income (loss) attributable to BorgWarner Inc.		5	(138)	4	(78)
Comprehensive income attributable to BorgWarner Inc.	[1]	177	134	336	419
Net earnings attributable to the noncontrolling interest, net of tax		10	12	21	24
Other comprehensive loss attributable to the noncontrolling interest	[1]	(3)	(6)	(2)	(4)
Comprehensive income		$ 184	$ 140	$ 355	$ 439

[1] Net of income taxes.