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Schedule II Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 6,886 | $ 8,077 |
Deductions | (17,605) | (20,480) |
Balance at end of period | 6,246 | 6,886 | $ 8,077
Allowance For Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 232 | 232 | 191
Charged to costs and expenses | (16) | 13 | 12
Charged to other accounts |  | (9) | 51
Deductions | (7) | (4) | (22)
Balance at end of period | 209 | 232 | 232
Valuation Allowance in Tax Carryforward Losses And Deductions [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 1,633 | 1,504 | 1,690
Charged to costs and expenses | 555 | 407 | 173
Charged to other accounts |  | 5 | 390
Deductions | (214) | (283) | (749)
Balance at end of period | $ 1,974 | $ 1,633 | $ 1,504

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