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Impairment - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment (reversal) charge | $ 122 | $ (18)
Impairment charges, net | $ 86 | (55)
Porto Trombetas (MRN) |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment (reversal) charge |  | 35
Impairment charges, net |  | 23
Rio Tinto Iron and Titanium Quebec Operations ("RTITQO") | Minerals |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Expected term of business transformation (in months) | 24 months |
Effective rate | 7.60% |
Recoverable amount | $ 1,780 |
Impairment (reversal) charge | 122 | 0
Impairment charges, net | 86 |
Post-tax net present value of cash-generating unit decrease due to carbon tax per tonne after sensitivity analysis | $ 250 |
Carbon tax per tonne increase sensitivity analysis | 25.00% |
Tiwai Point | Aluminium |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment (reversal) charge | $ 0 | $ (41)
Impairment charges, net | $ 0 |

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