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Tax - Summary of Reconciliation of Tax Paid to Total Tax Charge in Income Statement (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation Of Tax Paid [Abstract] |  |  |
Current tax charge in the income statement | $ 207 | $ 56 | $ 158
Current tax credit in the statement of comprehensive income |  | (12) | (2)
Current tax credit taken directly to equity | (12) | (8) | (8)
Total current tax charge | 195 | 36 | 148
Movements to tax contingencies within the income statement | 3 | 11 | (7)
Timing differences of cash tax paid and foreign exchange differences | (26) | 83 | (31)
Tax paid per cash flow | $ 172 | $ 130 | $ 110
Cash tax rate on total profits | 25.00% | 22.00% | 8.00%

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- Definition The amount of current tax expense (income) and adjustments for the current tax of prior periods. [Refer: Current tax expense (income); Adjustments for current tax of prior periods] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 80 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_80&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of current tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Retained earnings; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash flows from income taxes paid or refunded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_35&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Cash tax rate on total profits. + References No definition available. + Details
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- Definition Income tax relating to components of other comprehensive income current period. + References No definition available. + Details
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- Definition Movements to tax contingencies within income statement. + References No definition available. + Details
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- Definition Net current tax charge. + References No definition available. + Details
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- Definition Reconciliation of tax paid. + References No definition available. + Details
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- Definition Timing differences of cash tax paid and foreign exchange differences. + References No definition available. + Details
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