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Tax - Summary of Tax on (Loss)/Profit (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income tax [line items] |  |  |
Current tax | $ 143 | $ 34 | $ 159
Origination and reversal of temporary differences | (21) | (35) | 11
Changes in tax rates and tax laws | (25) | (8) | 2
Adjustments to estimated recoverable deferred tax assets | 2 | (14) | (2)
Reduction in deferred tax expense by previously unrecognised deferred tax assets | 0 | (1) |
Adjustments in respect of prior periods | (3) | 4 | (14)
Deferred tax | (47) | (54) | (3)
Income tax charge/(credit) for the year | 96 | (20) | 156
Profit before exceptional items | 125 | 32 | 176
Tax on exceptional items (note 6) | (29) | (52) | (20)
Exceptional items [member] |  |  |
Income tax [line items] |  |  |
Current tax | (2) | 14 | 4
Deferred tax | 5 | 38 | 16
Income tax charge/(credit) for the year | 3 | 52 | 20
Tax on exceptional items (note 6) | (3) | (52) | (20)
Exceptional tax (note 6) | (26) |  |
United Kingdom [member] |  |  |
Income tax [line items] |  |  |
Current period | 1 |  | 5
Adjustments in respect of prior periods | 0 | (2) | 13
Current tax | 1 | (2) | 18
Foreign tax [member] |  |  |
Income tax [line items] |  |  |
Current period | 138 | 43 | 154
Benefit of tax reliefs on which no deferred tax previously recognised | 0 | (2) | (2)
Adjustments in respect of prior periods | 4 | (5) | (11)
Current tax | $ 142 | $ 36 | $ 141

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