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Staff Costs and Directors' Emoluments - Summary of Staff Costs (Parenthetical) (Detail) - Exceptional items [member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | $ 36 | $ 13 | $ 1
System Fund [member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | $ 21 | $ 9 | $ 0

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- Details
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- Details
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