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Tax - Summary of Tax on Profit (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax [line items] |  |  |
Corporate income tax rate | 19.00% | 19.25% | 20.00%
Effect of ruling |  |  | $ 83
Total income tax charge for the year | $ 133 | $ 115 | 173
Before exceptional items [member] | United States [member] |  |  |
Income tax [line items] |  |  |
Total income tax charge for the year | $ 94 | $ 157 | $ 160

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