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Financial instruments and risk management - Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Currency translation adjustments	$ (546)	$ 890
Level 3
Disclosure of detailed information about financial instruments [line items]
Opening balance	395	383
Currency translation adjustments	(6)	16
Total realised gains/(losses) included in consolidated sales revenue	27	11
Total realised gains/(losses) included in net operating costs	(50)	(39)
Total unrealised gains included in net operating costs	68	24
Total unrealised (losses)/gains transferred into other comprehensive income through cash flow hedges	(212)	26
Additions to (financial liabilities)/assets	(21)	1
Disposals/maturity of financial instruments	(6)	(27)
Transfers	(18)	0
Closing balance	177	395
Net gains for the year included in the income statement for assets and liabilities held at year end	$ 20	$ 0

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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.

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- Definition

The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2021-01-01
-Paragraph 93
-Subparagraph e
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e_iii&doctype=Standard
-URIDate 2021-03-24

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- Definition

The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2021-01-01
-Paragraph 93
-Subparagraph e
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2021-en-r&anchor=para_93_e_iv&doctype=Standard
-URIDate 2021-03-24

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Adjustment on currency translation.

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Disposal or maturity of financial instruments.

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Financial assets and financial liabilities at fair value.

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Gains (losses) recognised in profit or loss for assets and liabilities held.

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- Definition

Total realised gains or losses related to Level 3 financial assets and liabilities included in consolidated sales revenue.

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Total realised gains or losses related to Level 3 financial assets and liabilities included in net operating costs.

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Unrealised gain or loss transferred into other comprehensive income.

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Total unrealised gains related to Level 3 financial assets and liabilities included in net operating costs.

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