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Impairment charges net of reversals - Additional information (Detail) $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 01, 2024 USD ($) | May 30, 2024 MW | Oct. 17, 2022 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 22, 2025 USD ($)
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment charges net of reversals, pre tax |  |  |  |  | $ 561 | $ 936 | $ 52 |
Impairment charge, net amount |  |  |  |  | $ 534 | 652 | 52 |
Power arrangement, agreement term |  |  |  |  | 20 years |  |  |
Impairment loss (reversal) excluded from underlying earnings |  |  |  |  | $ 538 | 936 | (150) |
Deferred tax assets |  |  |  |  | 4,016 | 3,624 |  |
Loss on disposal |  |  |  |  | 105 |  |  |
Notional amount |  |  |  |  | 890 | 1,050 |  |
Gains/(losses) on consolidation and disposal of interests in businesses |  |  |  |  | 1,214 | 0 | (105) |
MRN Porto Trombetas |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment charges net of reversals, pre tax |  |  |  |  | 35 |  |  |
New Zealand Aluminium Smelters Limited |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Gains/(losses) on consolidation and disposal of interests in businesses | $ 638 |  |  |  |  |  |  |
Arcadium Lithium | Loan Agreement Entered Into |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 300
Canada |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Consideration for sale |  |  | $ 150 |  |  |  |  |
Proceeds from sale |  |  | 80 |  |  |  |  |
Loss on disposal |  |  | 105 |  |  |  |  |
Canada | Uranium Energy Corp |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Shares received (in shares) |  |  | $ 70 |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment charges net of reversals, pre tax |  |  |  |  | $ 538 | $ 1,167 | 0 |
Copper - Rio Tinto Kennecott |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Expected life of mine percent |  |  |  |  | 6.30% |  |  |
Discount rate applied to cash flow projections |  |  |  |  | 2.50% |  |  |
Carrying amount of asset or cash-generating unit |  |  |  |  | $ 2,200 |  |  |
Amount by which unit's recoverable amount exceeds its carrying amount |  |  |  |  | 500 |  |  |
Amount by which unit's recoverable amount exceeds its carrying amount, aspirational leadership scenario |  |  |  |  | $ 1,000 |  |  |
Alumina Refineries | Aluminium |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Discount rate applied to cash flow projections |  |  |  |  | 6.60% | 6.60% |  |
Carrying amount of asset or cash-generating unit |  |  |  |  | $ 151 |  |  |
Impairment charges net of reversals, pre tax |  |  |  |  | 461 | $ 1,175 | 0 |
Impairment charge, net amount |  |  |  |  | 503 | 828 |  |
Impairment loss (reversal) excluded from underlying earnings |  |  |  |  |  | $ 1,175 |  |
Reduction in carbon emissions |  |  |  |  |  | 0.50 |  |
Tiwai Point | Aluminium |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment charges net of reversals, pre tax |  |  |  | $ (41) | (41) | $ 0 | 0 |
Impairment charge, net amount |  |  |  |  | (78) |  |  |
Power arrangement, agreement term |  | 20 years |  |  |  |  |  |
Power arrangement, set pricing, amount of power | MW |  | 572 |  |  |  |  |  |
MRN Porto Trombetas | Aluminium |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment charges net of reversals, pre tax |  |  |  |  | 23 | 0 | 0 |
Impairment charge, net amount |  |  |  |  | $ 23 |  |  |
Diavik | Minerals |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Discount rate applied to cash flow projections |  |  |  |  | 6.60% |  |  |
Impairment charges net of reversals, pre tax |  |  |  |  | $ 118 | 0 | $ 0 |
Impairment charge, net amount |  |  |  |  | 86 |  |  |
Impairment loss (reversal) excluded from underlying earnings |  |  |  |  | 118 |  |  |
Yarwun Alumina Refinery | Aluminium | Property, plant and equipment |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment loss (reversal) excluded from underlying earnings |  |  |  |  |  | 948 |  |
QAL Operations | Aluminium | Property, plant and equipment |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment loss (reversal) excluded from underlying earnings |  |  |  |  |  | 227 |  |
Simandou Project | Guinea |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment loss (reversal) excluded from underlying earnings |  |  |  |  |  | (239) |  |
Deferred tax assets |  |  |  |  |  | 152 |  |
Simandou Project | Property, plant and equipment | Guinea |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment loss (reversal) excluded from underlying earnings |  |  |  |  |  | (8) |  |
Simandou Project | Exploration and evaluation | Guinea |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment loss (reversal) excluded from underlying earnings |  |  |  |  |  | (231) |  |
Pacific Aluminium | Aluminium |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Discount rate applied to cash flow projections |  |  |  |  |  |  | 6.60% |
Impairment charges net of reversals, pre tax |  |  |  |  | 0 | $ 0 | $ 202 |
Impairment charge, net amount |  |  |  |  | $ 0 |  |  |
Reduction in carbon emissions |  |  |  |  |  |  | 0.50 |

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