CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 1,426	$ 2,551	$ 3,705	$ 5,117
Cost of sales	1,252	2,038	3,084	4,085
Gross profit	174	513	621	1,032
Selling, general and administrative expenses	184	212	397	438
Other expense, net	68	16	113	45
Operating (loss) income	(78)	285	111	549
Equity in affiliates’ earnings, net of tax	(2)	(9)	(7)	(18)
Interest income	(3)	(2)	(5)	(5)
Interest expense	18	14	30	28
Other postretirement (income) expense	(1)	27	(3)	27
(Loss) earnings before income taxes and noncontrolling interest	(90)	255	96	517
(Benefit) provision for income taxes	(6)	73	43	164
Net (loss) earnings	(84)	182	53	353
Net earnings attributable to the noncontrolling interest, net of tax	14	10	22	21
Net (loss) earnings attributable to BorgWarner Inc.	$ (98)	$ 172	$ 31	$ 332
(Loss) earnings per share - basic (in dollar per share)	$ (0.47)	$ 0.84	$ 0.15	$ 1.61
(Loss) earnings per share - diluted (in dollar per share)	$ (0.47)	$ 0.83	$ 0.15	$ 1.60
Weighted average shares outstanding:
Basic (in shares)	206.0	205.7	205.8	206.1
Diluted (in shares)	206.0	206.8	206.4	207.0