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Contingencies and commitments - Additional information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 06, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of contingent liabilities [line items] |  |  |
Contractual capital commitments |  | $ 1,872.0 | $ 1,400.0
Contractually committed decarbonisation capital commitments |  | 114.0 | 123.0
Borrowings |  | 12,442.0 | 13,001.0
Notional amount |  | $ 890.0 | 1,050.0
Oyu Tolgoi LLC |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Proportion of ownership interest in joint venture (%) |  | 66.00% |
Oyu Tolgoi LLC | Project Finance Debt |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Borrowings |  | $ 5,500.0 | 4,700.0
Oyu Tolgoi LLC | Project Finance Debt | External Third Party Lenders |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Borrowings |  | $ 3,900.0 | 3,900.0
Erdenes Oyu Tolgoi LLC |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Proportion of ownership interest in joint venture (%) |  | 34.00% |
Larger Than Twenty Five Years |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Other commitments |  | $ 154.0 | 173.0
Due within 1 year |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Other commitments |  | 27.0 | 10.0
Notional amount |  | 174.0 | 169.0
Bottom of range |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Estimated incremental capital expenditures |  | 5,000.0 |
Top of range |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Estimated incremental capital expenditures |  | 6,000.0 |
Minera Escondida Ltda |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Minera Escondida Limitada undrawn shareholder line of credit Rio Tinto share |  | $ 225.0 | $ 225.0
Proportion of ownership interest in joint venture (%) |  | 30.00% | 30.00%
Contingent liabilities related to joint ventures | Rio Tinto Finance (USA) Limited and Rio Tinto Finance (USA) plc |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Contractual payments | $ 10.5 |  |
Contingent liabilities related to joint ventures | Rio Tinto Finance (USA) Limited and Rio Tinto Finance (USA) plc | Financial guarantee contracts |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Amounts guaranteed by parent companies |  | $ 7,500.0 | $ 7,500.0
Contingent liabilities related to joint ventures | Rio Tinto Finance (USA) Limited and Rio Tinto Finance (USA) plc | Bonds | Financial guarantee contracts |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Amounts guaranteed by parent companies |  | 6,200.0 | 6,200.0
Contingent liabilities related to joint ventures | Rio Tinto Finance (USA) Limited and Rio Tinto Finance (USA) plc | Debt securities | Financial guarantee contracts |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Amounts guaranteed by parent companies |  | $ 600.0 | $ 1,100.0

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