CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income attributable to Wabtec shareholders	$ 283	$ 240	$ 844	$ 600
Foreign currency translation gain (loss)	114	(106)	(23)	(82)
Unrealized (loss) gain on derivative contracts	(2)	21	11	39
Change in unrealized gain (loss) on pension and post-retirement benefit plans	1	3	(3)	1
Other comprehensive income (loss) before tax	113	(82)	(15)	(42)
Income tax expense related to components of other comprehensive income	0	(7)	(2)	(10)
Other comprehensive income (loss), net of tax	113	(89)	(17)	(52)
Comprehensive income attributable to Wabtec shareholders	$ 396	$ 151	$ 827	$ 548