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Equity share capital - Summary of Cash Flow Hedging Reserve (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about hedged items [line items] |  |  |
Costs of hedging deferred and recognised in OCI | $ (6) | $ (6) | $ (1)
Reclassified from OCI to profit or loss -included in financial expenses | (13) | 38 | (8)
Deferred tax | (4) | 0 | (1)
Cash flow hedging reserve [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reserve Of Cash flow Hedges Beginning Balance | (6) | (4) | 0
Costs of hedging deferred and recognised in OCI | (6) | (6) | (1)
Change in fair value of currency swaps recognised in OCI | (1) | (34) | 4
Reclassified from OCI to profit or loss -included in financial expenses | (13) | 38 | (8)
Deferred tax | 4 |  | 1
Exchange adjustments | (2) |  |
Reserve Of Cash flow Hedges Ending Balance | (24) | (6) | (4)
Cash flow hedging reserve [member] | Value of currency swaps [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reserve Of Cash flow Hedges Beginning Balance | 1 | (3) | 0
Change in fair value of currency swaps recognised in OCI | (1) | (34) | 4
Reclassified from OCI to profit or loss -included in financial expenses | (13) | 38 | (8)
Deferred tax | 4 |  | 1
Exchange adjustments | (2) |  |
Reserve Of Cash flow Hedges Ending Balance | (11) | 1 | (3)
Cash flow hedging reserve [member] | Costs of hedging [member] |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Reserve Of Cash flow Hedges Beginning Balance | (7) | (1) | 0
Costs of hedging deferred and recognised in OCI | (6) | (6) | (1)
Reserve Of Cash flow Hedges Ending Balance | $ (13) | $ (7) | $ (1)

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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_91_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -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 2020-01-01 + 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 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 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 2020-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of other comprehensive income, net of tax, 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 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_91_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 24C -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24C_b_iv&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2020-01-01 -Paragraph 6.5.11 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2020-en-r&anchor=para_6.5.11&doctype=Standard -URIDate 2020-01-01 + Details
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