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Tax - Tax Paid - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current tax expense (income) and adjustments for current tax of prior periods [abstract] |  |  |
Net tax paid | $ 172 | $ 130 | $ 110
Net tax paid in operating activities | 147 | $ 130 | 109
Net tax paid in investing activities | $ 25 |  | $ 1
Cash tax rate on total profits | 25.00% | 22.00% | 8.00%
Cash tax rate on profits prior to exceptional accounting gains |  |  | 20.00%

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