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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Numerator        
Net income attributable to Wabtec shareholders $ 289 $ 191 $ 561 $ 360
Denominator        
Weighted average shares outstanding- basic (in shares) 175.4 178.9 176.0 179.4
Assumed conversion of dilutive stock-based compensation plans (in shares) 0.6 0.5 0.6 0.6
Weighted average shares outstanding- diluted (in shares) 176.0 179.4 176.6 180.0
Net income attributable to Wabtec shareholders per common share        
Basic (in dollars per share) $ 1.64 $ 1.06 $ 3.18 $ 2.00
Diluted (in dollars per share) $ 1.64 $ 1.06 $ 3.17 $ 2.00