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EARNINGS (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic earnings (loss) per share:        
Net earnings (loss) attributable to BorgWarner Inc.  $ 247 $ (98) $ 312 $ 31
Weighted average shares of common stock outstanding (in shares) 238,200,000 206,000,000.0 237,900,000 205,800,000
Basic (loss) earnings per share of common stock (in dollar per share) $ 1.03 $ (0.47) $ 1.31 $ 0.15
Diluted earnings (loss) per share:        
Net earnings (loss) attributable to BorgWarner Inc.  $ 247 $ (98) $ 312 $ 31
Weighted average shares of common stock outstanding (in shares) 238,200,000 206,000,000.0 237,900,000 205,800,000
Effect of stock-based compensation (in shares) 1,400,000 0 1,100,000 600,000
Weighted average shares of common stock outstanding including dilutive shares (in shares) 239,600,000 206,000,000.0 239,000,000.0 206,400,000
Diluted earnings per share of common stock (in dollar per share) $ 1.03 $ (0.47) $ 1.30 $ 0.15
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0 0 0
Performance Shares        
Diluted earnings (loss) per share:        
Antidilutive securities excluded from computation of earnings per share (in shares) 778,962   852,170 244,700
Share-based Awards        
Diluted earnings (loss) per share:        
Antidilutive securities excluded from computation of earnings per share (in shares)   2,800,000