EARNINGS PER SHARE - Summary of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator
Net income attributable to Wabtec shareholders	$ 1,056	$ 815	$ 633
Less: Net income allocated to non-vested restricted stock	(3)	(2)	(2)
Numerator for basic earnings per common share	1,053	813	631
Numerator for diluted earnings per common share	$ 1,053	$ 813	$ 631
Denominator
Weighted average shares outstanding - basic (in shares)	174,100	178,800	182,200
Weighted average shares outstanding - diluted (in shares)	174,800	179,500	182,800
Earnings per common share attributable to Wabtec shareholders
Basic (in dollars per share)	$ 6.05	$ 4.54	$ 3.46
Diluted (in dollars per share)	$ 6.04	$ 4.53	$ 3.46
Awards Excluding Restricted Stock
Denominator
Assumed conversion of dilutive stock-based compensation plans (in shares)	300	400	400
Restricted Stock
Denominator
Assumed conversion of dilutive stock-based compensation plans (in shares)	400	300	200