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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about hedged items [line items] |  |  |  |
Costs of hedging deferred and recognised in OCI | $ 0 | $ 3 | [1] | $ 2
Reclassified from OCI to profit or loss - included in financial expenses | 28 | (43) | [1] | 96
Deferred tax | 0 | 2 |  | (7)
Reserve of Cash Flow Hedges [member] |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |
Reserve Of Cash flow Hedges Beginning Balance |  | 5 |  | (24)
Costs of hedging deferred and recognised in OCI |  | 3 |  | 2
Change in fair value of currency swaps recognised in OCI | (30) | 33 |  | (62)
Reclassified from OCI to profit or loss - included in financial expenses | 28 | (43) |  | 96
Deferred tax |  | 2 |  | (7)
Reserve Of Cash flow Hedges Ending Balance | (2) |  |  | 5
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 | 8 | 16 |  | (11)
Change in fair value of currency swaps recognised in OCI | (30) | 33 |  | (62)
Reclassified from OCI to profit or loss - included in financial expenses | 28 | (43) |  | 96
Deferred tax |  | 2 |  | (7)
Reserve Of Cash flow Hedges Ending Balance | 6 | 8 |  | 16
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) | (11) |  | (13)
Costs of hedging deferred and recognised in OCI |  | 3 |  | 2
Reserve Of Cash flow Hedges Ending Balance | $ (8) | $ (8) |  | $ (11)
[1] | In 2023, gains/(losses) on net investment hedges have been presented on a separate line. The 2022 amount was previously presented within ‘Exchange (losses)/gains on retranslation of foreign operations’.

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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 2023-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_b&doctype=Standard -URIDate 2023-03-23 + 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 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_90&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_7&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of reclassification adjustments on cash flow hedges for which the hedged item affected profit or loss, net of tax. [Refer: Reclassification adjustments on cash flow hedges, net of tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24E -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph b -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_b_iv&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_e&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2023-01-01 -Paragraph 6.5.11 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2023-en-r&anchor=para_6.5.11&doctype=Standard -URIDate 2023-03-23 + Details
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