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Income Taxes - Reconciliation of Liabilities Associated with Uncertain Tax Provisions (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Balance at beginning of year | $ 1,393 | $ 1,419 | $ 1,285
Additions based on tax positions related to the current year | 88 | 132 | 70
Additions for tax positions of prior years | 145 | 58 | 119
Additions related to acquisitions |  |  | 127
Impact of changes in exchange rates | (41) | 23 | (25)
Settlements with tax authorities | (22) | (41) | (45)
Reductions for tax positions of prior years | (57) | (157) | (85)
Reductions due to the lapse of the applicable statute of limitations | (73) | (41) | (27)
Balance at end of year | $ 1,433 | $ 1,393 | $ 1,419

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