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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Performance shares excluded from diluted earnings per share (in shares) 925,379 114,720
Basic earnings per share:    
Net earnings attributable to BorgWarner Inc.  $ 65 $ 129
Weighted average shares of common stock outstanding (shares) 237,700,000 205,700,000
Basic (loss) earnings per share of common stock (in dollar per share) $ 0.27 $ 0.63
Diluted earnings per share:    
Net earnings attributable to BorgWarner Inc.  $ 65 $ 129
Weighted average shares of common stock outstanding (shares) 237,700,000 205,700,000
Effect of stock-based compensation (shares) 700,000 500,000
Weighted average shares of common stock outstanding including dilutive shares (shares) 238,400,000 206,200,000
Diluted earnings per share of common stock (in dollar per share) $ 0.27 $ 0.63
Antidilutive securities excluded from computation of earnings per share (shares) 0 0