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Tax - Reconciliation Between Total Tax Rate and Tax Rate Before Exceptional Items and System Fund (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reconciliation between tax rate and tax rate before exceptional items and System Fund [abstract] |  |  |
Group income statement | $ 542 | $ 482 | $ 653
Exceptional items (note 6) | 148 | 104 | (4)
System Fund | 49 | 146 | 34
Profit loss before exceptional items and System Fund | 739 | 732 | 683
Group income statement | 156 | 132 | 118
Exceptional items (note 6) | 20 | 27 | 85
Other |  |  | (3)
Income tax expense before exceptional items and System Fund | $ 176 | $ 159 | $ 200
Group income statement | 28.80% | 27.40% | 18.10%
Average effective tax rate before exceptional items and System Fund | 23.80% | 21.70% | 29.30%

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