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Equity share capital - Summary of Cash Flow Hedge Reserves (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about hedged items [line items] |  |  |
Costs of hedging deferred and recognised in OCI | $ (11) | $ 0 | $ 3
Deferred tax | (11) | 0 | 2
Reserve of Cash Flow Hedges [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reserve Of Cash flow Hedges Beginning Balance | (2) | 0 | 5
Costs of hedging deferred and recognised in OCI | (11) |  | 3
Change in fair value of currency swaps recognised in OCI | (113) | (30) | 33
Reclassified from OCI to profit or loss - included in financial expenses | 165 | 28 | (43)
Deferred tax | (11) |  | 2
Reserve Of Cash flow Hedges Ending Balance | 28 | (2) | 0
Reserve of Cash Flow Hedges [member] | Cash flow hedge reserves [Member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reserve Of Cash flow Hedges Beginning Balance | 6 | 8 | 16
Change in fair value of currency swaps recognised in OCI | (113) | (30) | 33
Reclassified from OCI to profit or loss - included in financial expenses | 165 | 28 | (43)
Deferred tax | (11) |  | 2
Reserve Of Cash flow Hedges Ending Balance | 47 | 6 | 8
Reserve of Cash Flow Hedges [member] | Costs of hedging reserve [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reserve Of Cash flow Hedges Beginning Balance | (8) | (8) | (11)
Costs of hedging deferred and recognised in OCI | (11) |  | 3
Change in fair value of currency swaps recognised in OCI | 0 |  |
Reclassified from OCI to profit or loss - included in financial expenses | 0 |  |
Deferred tax | 0 |  |
Reserve Of Cash flow Hedges Ending Balance | $ (19) | $ (8) | $ (8)

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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax, before reclassification adjustments. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_90&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of other comprehensive income, net of tax, after reclassification adjustments, related to change in value of foreign currency basis spreads. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2024-01-01 -Paragraph 6.5.11 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2024-en-r&anchor=para_6.5.11&doctype=Standard -URIDate 2024-03-27 + Details
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