CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net sales	$ 4,520	$ 3,759	$ 8,700	$ 7,633
Cost of sales	3,652	3,047	7,082	6,171
Gross profit	868	712	1,618	1,462
Selling, general and administrative expenses	422	394	806	782
Restructuring expense	12	27	19	42
Other operating expense, net	51	19	70	14
Operating income	383	272	723	624
Equity in affiliates’ earnings, net of tax	(14)	(11)	(18)	(19)
Unrealized loss (gain) on debt and equity securities	54	(11)	69	28
Interest expense, net	12	15	22	30
Other postretirement expense (income)	3	(9)	5	(18)
Earnings before income taxes and noncontrolling interest	328	288	645	603
Provision for income taxes	106	57	193	148
Net earnings	222	231	452	455
Net earnings attributable to noncontrolling interest, net of tax	18	15	31	39
Net earnings attributable to BorgWarner Inc.	$ 204	$ 216	$ 421	$ 416
Earnings per share attributable to BorgWarner Inc. — basic (in dollar per share)	$ 0.87	$ 0.91	$ 1.81	$ 1.75
Earnings per share attributable to BorgWarner Inc. — diluted (in dollar per share)	$ 0.87	$ 0.91	$ 1.80	$ 1.74
Weighted average shares outstanding:
Basic (in shares)	233.4	236.9	233.1	237.6
Diluted (in shares)	234.4	238.0	234.3	238.5