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Impairment - Narrative (Details) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
May 30, 2024 MW | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Power arrangement, term of agreement | 20 years |  |  |
Power arrangement, amount of power with set pricing (in megawatts) | MW | 572 |  |  |
Impairment (reversal) charge |  | $ (18) | $ 1,175 |
Deferred tax assets |  | 3,435 |  | $ 3,624
Impairment charges, net |  | (55) | 828 |
Impairment (reversals net of charges)/charges |  | (41) | 1,175 |
Impairment Charge (Reversal) |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Deferred tax assets |  | 37 |  |
Porto Trombetas (MRN) |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment (reversal) charge |  | 35 |  |
Impairment charges, net |  | 23 |  |
Property, plant and equipment |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment (reversal) charge |  | (41) | 1,175 |
Tiwai Point | Aluminium |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment (reversal) charge |  | (41) | 0 |
Impairment charges, net |  | (78) |  |
Alumina refineries | Aluminium |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment (reversal) charge |  | 0 | 1,175 |
Impairment charges, net |  | $ 0 | $ 828 |
Discount rate applied to cash flow projections |  |  | 6.60% |
Impairment (reversals net of charges)/charges |  |  | $ 1,175 |
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 (reversals net of charges)/charges |  |  | $ 948 |
Queensland Alumina Limited (QAL) | Aluminium |  |  |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |  |  |
Impairment (reversals net of charges)/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 (reversals net of charges)/charges |  |  | $ 227 |

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_o&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_56&doctype=Standard -URIDate 2023-03-23 + Details
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