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Valuation And Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 52 | $ 39 | $ 36
Expensed | (73) | (41) | (34)
Other Adjustments | (3) | 0 | 2
Deductions | (68) | (28) | (29)
Balance at End of Period | 60 | 52 | 39
Tax Valuation Allowance |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 214 | 311 | 331
Expensed | (1) | (95) | 3
Other Adjustments | 6 | (2) | 17
Deductions | 0 | 0 | 0
Balance at End of Period | $ 207 | $ 214 | $ 311

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