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Tax - Summary of Tax on (Loss)/Profit (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income tax [line items] |  |  |
Corporate income tax rate | 19.00% | 19.00% | 19.00%
Total income tax charge for the year | $ (20) | $ 156 | $ 132
Before exceptional items [member] | United States [member] |  |  |
Income tax [line items] |  |  |
Total income tax charge for the year | $ 41 | $ 113 | $ 93

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