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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation Of Tax Paid [abstract] |  |  |
Current tax charge in the Group income statement | $ (34) | $ (159) | $ (95)
Current tax (charge)/credit in the Group statement of comprehensive income | (1) | 2 | 1
Current tax credit taken directly to equity |  | 4 | 8
Total current tax charge | (35) | (153) | (86)
Movements To Tax Contingencies | (8) | 3 | (4)
Timing differences of cash tax paid and foreign exchange differences | 2 | 9 | 22
Tax paid per cash flow | $ (41) | $ (141) | $ (68)

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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 2020-01-01 -Paragraph 80 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_80&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 81 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_90&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Movements To Tax Contingencies + 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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- Definition Total current tax charge. + References No definition available. + Details
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