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Schedule II Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | $ 8,077 |  |
Deductions | (20,480) |  |
Balance at end of period | 6,886 | $ 8,077 |
Allowance For Doubtful Accounts [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 232 | 191 | $ 146
Charged to costs and expenses | 13 | 12 | 5
Charged to other accounts | (9) | 51 | 61
Deductions | (4) | (22) | (21)
Balance at end of period | 232 | 232 | 191
Valuation Allowance in Tax Carryforward Losses And Deductions [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at beginning of period | 1,504 | 1,690 | 760
Charged to costs and expenses | 407 | 173 | 135
Charged to other accounts | 5 | 390 | 1,137
Deductions | (283) | (749) | (342)
Balance at end of period | $ 1,633 | $ 1,504 | $ 1,690

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