EARNINGS PER SHARE - Schedule of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator
Net income attributable to Wabtec shareholders	$ 362	$ 322
Less: Net income allocated to non-vested restricted stock	(1)	(1)
Numerator for basic earnings per common share	361	321
Numerator for diluted earnings per common share	$ 361	$ 321
Denominator
Weighted average shares outstanding- basic (in shares)	170.0	170.5
Weighted average shares outstanding- diluted (in shares)	170.7	171.3
Earnings per common share attributable to Wabtec shareholders
Basic (in dollars per share)	$ 2.12	$ 1.88
Diluted (in dollars per share)	$ 2.12	$ 1.88
Awards Excluding Restricted Stock
Denominator
Assumed conversion of dilutive stock-based compensation plans (in shares)	0.4	0.4
Restricted Stock
Denominator
Assumed conversion of dilutive stock-based compensation plans (in shares)	0.3	0.4