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Tax - Tax Paid - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current tax expense (income) and adjustments for current tax of prior periods [abstract] |  |  |
Net tax paid | $ 68 | $ 172 | $ 130
Net tax paid in operating activities | 66 | 147 | 130
Net tax paid in investing activities | $ 2 | $ 25 | $ 0

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