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Risks arising from Financial instruments - Summary of Hedging Reserve and Hedging Instruments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about hedging instruments [line items] |  |
As per 1 January | $ 376 | $ 397
Change in fair value of hedging instrument recognized in OCI | 888 | 384
Reclassified to profit or loss / cost of inventory | (783) | (404)
As per 31 December | 481 | 376
Foreign currency futures [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
As per 1 January | 20 | 174
Change in fair value of hedging instrument recognized in OCI | 766 | 353
Reclassified to profit or loss / cost of inventory | (107) | (507)
As per 31 December | 679 | 20
Commodity Contracts [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
As per 1 January | 274 | 117
Change in fair value of hedging instrument recognized in OCI | 123 | 31
Reclassified to profit or loss / cost of inventory | (703) | 126
As per 31 December | (306) | 274
Other hedging instrument [member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
As per 1 January | 84 | 107
Reclassified to profit or loss / cost of inventory | 27 | (23)
As per 31 December | $ 111 | $ 84

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- Definition Hedge reserve + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The gains (losses) on hedging instruments in fair value hedges. [Refer: Fair value hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_24_a_i&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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- Definition The gains (losses) on the ineffective portion of cash flow hedges recognised in profit or loss. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_24_b&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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