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Entities accounted under the equity method Principal joint ventures - Summary of principal associates (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 17, 2024 | Dec. 31, 2024 | Nov. 01, 2024 | Sep. 30, 2024
Ordinary | Rio Tinto SimFer UK Limited |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (voting %) |  | 53.00% |  |
Boyne Smelters Limited |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Percentage of voting equity interests acquired |  |  | 14.11% |
Boyne Smelters Limited | Mitsubishi Corporation |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 11.65%
Boyne Smelters Limited | Sumimoto Chemical Company |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Percentage of voting equity interests acquired |  |  | 2.46% |
Boyne Smelters Limited | Ordinary |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (%) |  | 73.50% |  |
Mineracao Rio do Norte S.A. | Ordinary and Preferred |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (%) |  | 22.00% |  |
Winning Consortium Simandou Railway Pte. Ltd and Winning Consortium Simandou Ports Pte. Ltd |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (%) |  | 18.02% |  |
Proportion of ownership interest in associates, percent acquired | 34.00% |  |  |
Winning Consortium Simandou Railway Pte. Ltd and Winning Consortium Simandou Ports Pte. Ltd | Government Of Guinea |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (%) |  | 15.00% |  |
Winning Consortium Simandou Railway Pte. Ltd |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (%) |  | 18.02% |  |
Winning Consortium Simandou Ports Pte. Ltd |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (%) |  | 18.02% |  |
WCS Rail And Port Operations Held By Government Of Guinea |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (%) |  | 15.32% |  |
Halco (Mining) Inc |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (%) |  | 45.00% |  |
Halco (Mining) Inc | Compagnie des Bauxites de Guine |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |
Group interest (%) |  | 51.00% |  |
Name of subsidiary for incorporation |  | Compagnie des Bauxites de Guinée |  |
Country of subsidiary for incorporation |  | Guinea |  |

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