CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Assets, Current [Abstract]
Cash and cash equivalents	$ 488	$ 473
Accounts receivable	998	1,085
Unbilled accounts receivable	384	392
Inventories	1,828	1,689
Other current assets	213	193
Total current assets	3,911	3,832
Property, plant and equipment, net	1,468	1,497
Goodwill	8,567	8,587
Other intangible assets, net	3,632	3,705
Other noncurrent assets	860	833
Total noncurrent assets	14,527	14,622
Total Assets	18,438	18,454
Liabilities, Current [Abstract]
Accounts payable	1,058	1,012
Customer deposits	624	629
Accrued compensation	287	335
Accrued warranty	224	228
Current portion of long-term debt	14	2
Other accrued liabilities	673	704
Total current liabilities	2,880	2,910
Long-term debt	4,225	4,056
Accrued postretirement and pension benefits	72	77
Deferred income taxes	304	288
Contingent consideration	142	141
Other long-term liabilities	727	743
Total Liabilities	8,350	8,215
Commitments and contingencies (Note 14)
Equity
Common stock, $.01 par value; 500.0 shares authorized: 226.9 and 226.9 shares issued and 182.9 and 185.8 outstanding at March 31, 2022 and December 31, 2021, respectively	2	2
Additional paid-in capital	7,917	7,916
Treasury stock, at cost, 44.0 and 41.1 shares, at March 31, 2022 and December 31, 2021, respectively	(1,597)	(1,306)
Retained earnings	4,176	4,055
Accumulated other comprehensive loss	(449)	(466)
Total Westinghouse Air Brake Technologies Corporation shareholders’ equity	10,049	10,201
Noncontrolling interest	39	38
Total Equity	10,088	10,239
Total Liabilities and Equity	$ 18,438	$ 18,454