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SEC Schedule, Article 12-09, Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts | Schedule II—Valuation and Qualifying Accounts for the years ended December 31, 2021, 2020 and 2019:
(in millions) |  |  | Additions |  |  |  |
Description | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period
Allowance for doubtful accounts (a)
Year ended December 31, 2021 | $ | 13 |  |  | $ | 2 |  |  | $ | — |  |  | $ | (4) |  |  | $ | 11 |
Year ended December 31, 2020 | 11 |  |  | 9 |  |  | — |  |  | (7) |  |  | 13 |
Year ended December 31, 2019 | 9 |  |  | 5 |  |  | — |  |  | (3) |  |  | 11 |
Deferred tax asset valuation allowance
Year ended December 31, 2021 | $ | 21 |  |  | $ | (1) |  |  | $ | — |  |  | $ | — |  |  | $ | 20 |
Year ended December 31, 2020 | 17 |  |  | 4 |  |  | — |  |  | — |  |  | 21 |
Year ended December 31, 2019 | 18 |  |  | (1) |  |  | — |  |  | — |  |  | 17 |
_______________ (a)The deduction column represents uncollectible accounts written off, net of recoveries from Trade Receivables, in the Consolidated Balance Sheets.

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