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Income taxes - Summary tax losses carried forward (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Unutilized tax losses	$ 6,324	$ 4,933
Top of range [member]
Operating Loss Carryforwards [Line Items]
Unutilized tax losses	6,324
Bottom of range [member]
Operating Loss Carryforwards [Line Items]
Unutilized tax losses	$ 4,145

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- References

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- Definition

The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2021-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2021-03-24

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