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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator        
Net income attributable to Wabtec shareholders $ 191 $ 166 $ 360 $ 315
Denominator        
Weighted average shares outstanding- basic (in shares) 178.9 181.9 179.4 183.2
Assumed conversion of dilutive stock-based compensation plans (in shares) 0.5 0.5 0.6 0.5
Weighted average shares outstanding- diluted (in shares) 179.4 182.4 180.0 183.7
Net income attributable to Wabtec shareholders per common share        
Basic (in dollars per share) $ 1.06 $ 0.91 $ 2.00 $ 1.71
Diluted (in dollars per share) $ 1.06 $ 0.91 $ 2.00 $ 1.71