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Taxation - Summary of tax relating to components of other comprehensive income or loss (Parenthetical) (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Relating To Components Of Other Comprehensive Income That Will Be Reclassified To Profit Or Loss [Abstract] |  |  |
Deferred tax charge included in other comprehensive income | $ 325,000,000 | $ 153,000,000 | $ 33,000,000
Current tax charge included in other comprehensive income | $ 0 | $ 0 | $ 0

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- Definition Deferred tax expense (income) relating to components of other comprehensive income. + References No definition available. + Details
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