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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator        
Net income attributable to Wabtec shareholders $ 240 $ 160 $ 600 $ 475
Denominator        
Weighted average shares outstanding- basic (in shares) 178.6 181.3 179.1 182.6
Assumed conversion of dilutive stock-based compensation plans (in shares) 0.6 0.6 0.6 0.5
Weighted average shares outstanding- diluted (in shares) 179.2 181.9 179.7 183.1
Net income attributable to Wabtec shareholders per common share        
Basic (in dollars per share) $ 1.34 $ 0.88 $ 3.34 $ 2.60
Diluted (in dollars per share) $ 1.33 $ 0.88 $ 3.33 $ 2.59