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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation between tax rate and tax rate before exceptional items and System Fund [abstract] |  |  |
Group income statement | $ 361 | $ (280) | $ 542
Exceptional items (note 6) | 29 | 263 | 148
System Fund | 11 | 102 | 49
Profit/(loss) before exceptional items and System Fund | 401 | 85 | 739
Group income statement | 96 | (20) | 156
Exceptional items (note 6) | 29 | 52 | 20
System Fund revenue | 0 |  |
Income tax expense before exceptional items and System Fund | $ 125 | $ 32 | $ 176
Group income statement | 26.60% | 7.10% | 28.80%
Average effective tax rate before exceptional items and System Fund | 31.20% | 37.60% | 23.80%

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