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Tax - Summary of Tax on Profit (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income tax [line items] |  |  |
Total current tax | $ 159 | $ 95 | $ 207
Origination and reversal of temporary differences | 11 | 39 | (8)
Changes in tax rates and tax laws | 2 | 1 | (56)
Adjustments to estimated recoverable deferred tax assets | (2) | (2) | (9)
Adjustments in respect of prior periods | (14) | (1) | (16)
Total deferred tax | (3) | 37 | (89)
Total income tax charge for the year | 156 | 132 | 118
Profit before exceptional items | 176 | 159 | 203
Tax on exceptional items (note [6]) | (20) | (27) | (85)
Exceptional items [member] |  |  |
Income tax [line items] |  |  |
Total income tax charge for the year | (20) | (27) | (85)
Tax on exceptional items (note [6]) | (20) | (22) | 2
Exceptional tax (note [6]) |  | (5) | (87)
United Kingdom [member] |  |  |
Income tax [line items] |  |  |
Current period | 5 | 10 | 10
Adjustments in respect of prior periods | 13 | 4 | (2)
Total current tax | 18 | 14 | 8
Foreign tax [member] |  |  |
Income tax [line items] |  |  |
Current period | 154 | 95 | 210
Benefit of tax reliefs on which no deferred tax previously recognised | (2) | (1) | (13)
Adjustments in respect of prior periods | (11) | (13) | 2
Total current tax | $ 141 | $ 81 | $ 199

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