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Tax - Summary of Tax on Profit (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax [line items] |  |  |
Total current tax | $ 95 | $ 207 | $ 56
Origination and reversal of temporary differences | 40 | (8) | 54
Changes in tax rates and tax laws | 1 | (59) | (2)
Adjustments to estimated recoverable deferred tax assets | (2) | (9) | (25)
Adjustments in respect of prior periods | (1) | (16) | 90
Total deferred tax | 38 | (92) | 117
Total income tax charge for the year | 133 | 115 | 173
Profit before exceptional items | 160 | 203 | 185
Tax on exceptional items (note 6) | (27) | (88) | (12)
Exceptional items [member] |  |  |
Income tax [line items] |  |  |
Total income tax charge for the year | (27) | (88) | (12)
Tax on exceptional items (note 6) | (22) | 2 | (12)
Exceptional tax (note 6) | (5) | (90) |
United Kingdom [member] |  |  |
Income tax [line items] |  |  |
Current period | 10 | 10 | 10
Benefit of tax reliefs on which no deferred tax previously recognised | 0 |  | (7)
Adjustments in respect of prior periods | 4 | (2) | (1)
Total current tax | 14 | 8 | 2
Foreign tax [member] |  |  |
Income tax [line items] |  |  |
Current period | 95 | 210 | 151
Benefit of tax reliefs on which no deferred tax previously recognised | (1) | (13) |
Adjustments in respect of prior periods | (13) | 2 | (97)
Total current tax | $ 81 | $ 199 | $ 54

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