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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Earnings Per Share [Abstract]
Percent of income allocated to non-vested restricted stock			0.30%
Numerator
Net income attributable to Wabtec shareholders	$ 336	$ 289	$ 658	$ 561
Less: Net income allocated to non-vested restricted stock	(1)	(1)	(2)	(2)
Numerator for basic and diluted earnings per common share	335	288	656	559
Numerator for basic and diluted earnings per common share	$ 335	$ 288	$ 656	$ 559
Denominator
Weighted average shares outstanding- basic (in shares)	170.6	175.4	170.6	176.0
Weighted average shares outstanding- diluted (in shares)	171.2	176.0	171.2	176.6
Earnings per common share attributable to Wabtec shareholders
Basic (in dollars per share)	$ 1.96	$ 1.64	$ 3.84	$ 3.18
Diluted (in dollars per share)	$ 1.96	$ 1.64	$ 3.84	$ 3.17
Awards Excluding Restricted Stock
Denominator
Assumed conversion of dilutive stock-based compensation plans (in shares)	0.3	0.3	0.3	0.3
Restricted Stock
Denominator
Assumed conversion of dilutive stock-based compensation plans (in shares)	0.3	0.3	0.3	0.3

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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