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Risks arising from Financial instruments - Summary of Hedging Reserve and Hedging Instruments (Detail) - USD ($) $ in Millions	12 Months Ended
	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

X

- Definition

Hedge reserve

+ References

No definition available.

+ Details

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X

- 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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X

- 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

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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

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