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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reconciliation between tax rate and tax rate before exceptional items and System Fund [abstract] |  |  |
Group income statement | $ 485 | $ 656 | $ 632
Exceptional items and tax (note 6) | 104 | (4) | 29
System Fund revenue | (1,233) | (1,242) | (1,199)
System Fund expenses | 1,379 | 1,276 | 1,164
Other | 0 |  |
Profit loss before exceptional items and System Fund | 735 | 686 | 626
Group income statement | 133 | 115 | 173
Exceptional items and tax (note 6) | 27 | 88 | 12
System Fund revenue | 0 |  |
System Fund expenses | 0 |  |
Other | 0 | (3) | (1)
Income tax expense before exceptional items and System Fund | $ 160 | $ 200 | $ 184
Group income statement | 27.40% | 17.50% | 27.40%
Average effective tax rate before exceptional items and System Fund | 21.80% | 29.10% | 29.40%

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