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Staff costs and Directors' remuneration - Summary of Staff Costs (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
System Fund [member] | 2020 reorganisation programme [Member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | $ 20 |  |
Exceptional items [member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Settlement loss including transaction costs |  |  | $ 15
Exceptional items [member] | 2020 reorganisation programme [Member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | 27 | $ 9 | 21
Exceptional items [member] | Termination Benefits Of US funded [Member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Settlement loss including transaction costs |  |  | 15
Exceptional items [member] | System Fund [member] | Comprehensive efficiency programme [member] |  |  |
Disclosure of information about employees and directors [Line Items] |  |  |
Exceptional items | $ 0 | $ 8 | $ 21

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