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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II WESTINGHOUSE AIR BRAKE TECHNOLOGIES CORPORATION VALUATION AND QUALIFYING ACCOUNTS For each of the three years ended December 31
In millions |  | Balance at beginning of period |  | Charged/ (credited) to expense |  | Charged/ (credited) to other accounts (1) |  | Deductions from reserves (2) |  | Balance at end of period
2021 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 37 |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | 7 |  |  | $ | 32 |
Valuation allowance-taxes |  | $ | 42 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | 64 |
2020 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 20 |  |  | $ | 18 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 37 |
Valuation allowance-taxes |  | $ | 58 |  |  | $ | (16) |  |  | $ | — |  |  | $ | — |  |  | $ | 42 |
2019 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 17 |  |  | $ | 7 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 20 |
Valuation allowance-taxes |  | $ | 42 |  |  | $ | 16 |  |  | $ | — |  |  | $ | — |  |  | $ | 58 |
(1)Reserves of acquired/(sold) companies; valuation allowances for state and foreign deferred tax assets; impact of fluctuations in foreign currency exchange rates. (2)Actual disbursements and/or charges.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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