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SCHEDULE II - 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 II - VALUATION AND QUALIFYING ACCOUNTS |
(In millions) | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions |  | Balance at End of Period
Allowance for credit losses, deducted from accounts receivable |  |  |  |  |  |  |  |  |
Year Ended December 31, 2021 | $ | 67 |  |  | $ | 698 |  |  | $ | 112 |  |  | $ | (194) |  | (a) | $ | 683 |
Year Ended December 31, 2020 | 43 |  |  | 108 |  |  | — |  |  | (84) |  | (a) | 67 |
Year Ended December 31, 2019 | 32 |  |  | 95 |  |  | — |  |  | (84) |  | (a) | 43 |
Income tax valuation allowance, deducted from deferred tax assets |  |  |  |  |  |  |  |  |
Year Ended December 31, 2021 | $ | 266 |  |  | $ | (29) |  |  | $ | 11 |  |  | $ | — |  |  | $ | 248 |
Year Ended December 31, 2020 | 242 |  |  | 24 |  |  | — |  |  | — |  |  | 266 |
Year Ended December 31, 2019 | 3,794 |  |  | (3,543) |  |  | (9) |  |  | — |  |  | 242 |
(a) Represents principally net amounts charged as uncollectible

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