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Impairment charges - Narrative (Details) - 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
Property, plant and equipment |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges | $ 1,175 | 0
Alumina refineries | Aluminium |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Discount rate applied to cash flow projections | 6.60% |
Impairment charges | $ 1,175 | $ 0
Impairment charges, net | $ 828 |
Reduction in carbon emissions | 0.50 |
Increase in carbon tax | 0.10 |
Yarwun Alumina Refinery | Aluminium | Property, plant and equipment |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges | $ 948 |
Queensland Alumina Limited (QAL) | Aluminium |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges | 99 |
Recoverable amount of asset | 325 |
Expected post-tax impairment charge if project not approved | 325 |
Queensland Alumina Limited (QAL) | Aluminium | Property, plant and equipment |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges | $ 227 |

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- Definition The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_134_d_v&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_134_e_v&doctype=Standard -URIDate 2023-03-23 + 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 The higher of an asset’s (or cash-generating unit’s) fair value less costs of disposal and its value in use. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 130 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_130_e&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Carbon Emissions, Additions (Reductions) + References No definition available. + Details
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