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Tax - Summary of Tax on (Loss)/Profit (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income tax [line items] |  |  |
Current tax | $ 34 | $ 159 | $ 95
Origination and reversal of temporary differences | (35) | 11 | 39
Changes in tax rates and tax laws | (8) | 2 | 1
Adjustments to estimated recoverable deferred tax assets | (14) | (2) | (2)
Reduction in deferred tax expense by previously unrecognised deferred tax assets | (1) |  |
Adjustments in respect of prior periods | 4 | (14) | (1)
Deferred tax | (54) | (3) | 37
Income tax (credit)/charge for the year | (20) | 156 | 132
Profit before exceptional items | 32 | 176 | 159
Tax on exceptional items (note 6) | (52) | (20) | (27)
Exceptional items [member] |  |  |
Income tax [line items] |  |  |
Current tax | 14 | 4 | 21
Deferred tax | 38 | 16 | 1
Income tax (credit)/charge for the year | 52 | 20 | 27
Tax on exceptional items (note 6) | (52) | (20) | (22)
Exceptional tax (note 6) |  |  | (5)
United Kingdom [member] |  |  |
Income tax [line items] |  |  |
Current period |  | 5 | 10
Adjustments in respect of prior periods | (2) | 13 | 4
Current tax | (2) | 18 | 14
Foreign tax [member] |  |  |
Income tax [line items] |  |  |
Current period | 43 | 154 | 95
Benefit of tax reliefs on which no deferred tax previously recognised | (2) | (2) | (1)
Adjustments in respect of prior periods | (5) | (11) | (13)
Current tax | $ 36 | $ 141 | $ 81

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