CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income attributable to Wabtec shareholders	$ 558	$ 414	$ 327
Foreign currency translation (loss) gain	(136)	48	(106)
Unrealized (loss) gain on derivative contracts	(10)	8	(4)
Unrealized gain (loss) on pension benefit plans and post-retirement benefit plans	21	(14)	(22)
Other comprehensive (loss) income before tax	(125)	42	(132)
Income tax (expense) benefit related to components of other comprehensive (loss) income	(2)	2	6
Other comprehensive (loss) income, net of tax	(127)	44	(126)
Comprehensive income attributable to Wabtec shareholders	$ 431	$ 458	$ 201