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Tax - Summary of Reconciliation of Tax Charge (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of income tax reconciliation [line items] |  |  |
Other permanent differences | (0.50%) | 0.90% | 0.50%
Net effect of different rates of tax in overseas business | 1.50% | 1.50% | 6.30%
Aggregate percentage points |  | 0.70% |
Deferred tax assets | $ 122 | $ 134 |
UAE [Member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax assets | $ 9 |  |
Before exceptional items and System Funds [member] | United States [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Net effect of different rates of tax in overseas business | 1.20% | 1.30% | 6.90%
Before Exceptional Items System Funds And Foreign Exchange Gains [Member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Other permanent differences | 1.00% | 0.60% | 1.00%

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_o&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_56&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the application of foreign tax rates. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Aggregate percentage provision of previously unprovided deferred tax liabilities on temporary differences in subsidiaries. + References No definition available. + Details
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