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Impairment - Summary of impairment charges (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | $ 18 | $ (1,175)
Impairment charges (reversal), tax | 37 |
Non-controlling interests | 0 | 0
Net impairment reversals/(charges) in the income statement | 55 | (828)
Impairment reversals/(charges) of consolidated balances | 41 | (1,175)
Impairment charges related to EAUs (pre-tax) | (35) | 0
Net impairment reversals/(charges) in the financial information by business unit (page #) | 6 | (1,175)
Taxation | 49 | 347
Tiwai Point | Aluminium |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | 41 | 0
Impairment charges (reversal), tax | 37 |
Non-controlling interests | 0 |
Net impairment reversals/(charges) in the income statement | 78 |
Porto Trombetas (MRN) | Aluminium |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | (23) | 0
Impairment charges (reversal), tax | 0 |
Non-controlling interests | 0 |
Net impairment reversals/(charges) in the income statement | (23) |
Alumina refineries | Aluminium |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | 0 | (1,175)
Impairment charges (reversal), tax | 0 |
Non-controlling interests | 0 |
Net impairment reversals/(charges) in the income statement | 0 | (828)
Impairment reversals/(charges) of consolidated balances |  | (1,175)
Property, plant and equipment |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | 41 | $ (1,175)
Investment in equity accounted units (EAUs) |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | $ (23) |

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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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- Definition Impairment loss (reversal of impairment loss) recognised in profit or loss attributable to non-controlling interests. + References No definition available. + Details
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