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Impairment charges - Summary of impairment charges (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges |  | $ 0
Alumina refineries | Aluminium |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges | $ (1,175) | 0
Property, plant and equipment |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges | $ (1,175) | $ 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. + References No definition available. + Details
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- Definition The amount of impairment loss or reversal of impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_99&doctype=Standard -URIDate 2023-03-23 + Details
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