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EARNINGS PER SHARE - Summary of Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator      
Net income attributable to Wabtec shareholders $ 815 $ 633 $ 558
Denominator      
Weighted average shares outstanding - basic (in shares) 178.8 182.2 187.7
Effect of dilutive securities:      
Assumed conversion of dilutive stock-based compensation plans (in shares) 0.7 0.6 0.4
Weighted average shares outstanding - diluted (in shares) 179.5 182.8 188.1
Net income attributable to Wabtec shareholders per common share      
Basic (in dollars per share) $ 4.54 $ 3.46 $ 2.96
Diluted (in dollars per share) $ 4.53 $ 3.46 $ 2.96