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EARNINGS PER SHARE - Schedule of Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Basic earnings per share:        
Net earnings attributable to BorgWarner Inc.  $ 277 $ 224 $ 519 $ 381
Weighted average shares of common stock outstanding (in shares) 203.0 216.3 204.2 216.7
Basic earnings per share of common stock (in dollars per share) $ 1.36 $ 1.04 $ 2.54 $ 1.76
Diluted earnings per share:        
Net earnings attributable to BorgWarner Inc.  $ 277 $ 224 $ 519 $ 381
Weighted average shares of common stock outstanding (in shares) 203.0 216.3 204.2 216.7
Effect of stock-based compensation (in shares) 3.3 1.9 3.1 1.4
Weighted average shares of common stock outstanding including dilutive shares (in shares) 206.3 218.2 207.3 218.1
Diluted earnings per share of common stock (in dollars per share) $ 1.34 $ 1.03 $ 2.50 $ 1.75