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Commitments and contingencies (Details) - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Mar. 06, 2023 | Jun. 30, 2024 | Dec. 31, 2023
Other Disclosures [Line Items] |  |  |
Contingent liabilities indemnities and other performance guarantees |  | $ 445.0 | $ 435.0
Contingent liabilities incurred in relation to interests in joint ventures |  | 0.0 |
Capital commitments |  | 6,251.0 | 4,385.0
Contractual capital commitments |  | 2,100.0 | 1,400.0
Bottom of range |  |  |
Other Disclosures [Line Items] |  |  |
Estimated incremental capital expenditures related to decarbonisation projects |  | 5,000.0 |
Top of range |  |  |
Other Disclosures [Line Items] |  |  |
Estimated incremental capital expenditures related to decarbonisation projects |  | 6,000.0 |
Rio Tinto Finance Usa Limited And Rio Tinto Finance Usa Plc | Contingent liabilities related to joint ventures |  |  |
Other Disclosures [Line Items] |  |  |
Contractual payments | $ 10.5 |  |
Joint ventures |  |  |
Other Disclosures [Line Items] |  |  |
Capital commitments |  | $ 154.0 | $ 227.0

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