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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about hedged items [line items] |  |  |
Costs of hedging deferred and recognised in OCI | $ 2 | $ (6) | $ (6)
Reclassified from OCI to profit or loss -included in financial expenses | 96 | (13) | 38
Deferred tax | 7 | (4) | 0
Cash flow hedge reserves [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reserve Of Cash flow Hedges Beginning Balance | (24) | (6) | (4)
Costs of hedging deferred and recognised in OCI | 2 | (6) | (6)
Change in fair value of currency swaps recognised in OCI | (62) | (1) | (34)
Reclassified from OCI to profit or loss -included in financial expenses | 96 | (13) | 38
Deferred tax | (7) | 4 |
Exchange adjustments |  | (2) |
Reserve Of Cash flow Hedges Ending Balance | 5 | (24) | (6)
Cash flow hedge reserves [member] | Cash flow hedge reserves [Member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reserve Of Cash flow Hedges Beginning Balance | (11) | 1 | (3)
Costs of hedging deferred and recognised in OCI | 0 |  |
Change in fair value of currency swaps recognised in OCI | (62) | (1) | (34)
Reclassified from OCI to profit or loss -included in financial expenses | 96 | (13) | 38
Deferred tax | (7) | 4 |
Exchange adjustments |  | (2) |
Reserve Of Cash flow Hedges Ending Balance | 16 | (11) | 1
Cash flow hedge reserves [member] | Costs of hedging reserve [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reserve Of Cash flow Hedges Beginning Balance | (13) | (7) | (1)
Costs of hedging deferred and recognised in OCI | 2 | (6) | (6)
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 | $ (11) | $ (13) | $ (7)

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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 2021-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_91_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_23_c&doctype=Standard&book=b -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_90&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in equity resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Equity] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_7&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_91_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 24C -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24C_b_iv&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_e&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2021-01-01 -Paragraph 6.5.11 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2021-en-r&anchor=para_6.5.11&doctype=Standard -URIDate 2021-03-24 + Details
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