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EARNINGS PER SHARE - Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator        
Net income attributable to Wabtec shareholders $ 283 $ 240 $ 844 $ 600
Denominator        
Weighted average shares outstanding- basic (in shares) 173.4 178.6 175.1 179.1
Assumed conversion of dilutive stock-based compensation plans (in shares) 0.7 0.6 0.6 0.6
Weighted average shares outstanding- diluted (in shares) 174.1 179.2 175.7 179.7
Net income attributable to Wabtec shareholders per common share        
Basic (in dollars per share) $ 1.63 $ 1.34 $ 4.81 $ 3.34
Diluted (in dollars per share) $ 1.63 $ 1.33 $ 4.80 $ 3.33