EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 537	$ 500	$ 746
Weighted average shares of common stock outstanding (in shares)	238.1	213.0	205.7
Basic earnings per share of common stock (in dollar per share)	$ 2.25	$ 2.35	$ 3.63
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$ 537	$ 500	$ 746
Effect of stock-based compensation (in shares)	1.4	1.0	1.1
Weighted average shares of common stock outstanding including dilutive shares (in shares)	239.5	214.0	206.8
Diluted earnings per share of common stock (in dollar per share)	$ 2.24	$ 2.34	$ 3.61
Antidilutive securities excluded from computation of earnings per share ( in shares)	0.0	0.0	0.1