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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 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Basic earnings per share:        
Net earnings attributable to BorgWarner Inc.  $ 221 $ 158 $ 740 $ 539
Weighted average shares of common stock outstanding (in shares) 201.4 213.7 203.2 215.7
Basic earnings per share of common stock (in dollars per share) $ 1.10 $ 0.74 $ 3.64 $ 2.50
Diluted earnings per share:        
Net earnings attributable to BorgWarner Inc.  $ 221 $ 158 $ 740 $ 539
Weighted average shares of common stock outstanding (in shares) 201.4 213.7 203.2 215.7
Effect of stock-based compensation (in shares) 3.2 2.8 3.2 1.9
Weighted average shares of common stock outstanding including dilutive shares (in shares) 204.6 216.5 206.4 217.6
Diluted earnings per share of common stock (in dollars per share) $ 1.08 $ 0.73 $ 3.59 $ 2.48