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Principal subsidiaries - Subsidiaries financial information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [line items]      
Revenue $ 53,658 $ 54,041 $ 55,554
Profit/(loss) after tax 11,574 9,953 13,048
Profit/(loss) after tax – attributable to non-controlling interests 22 (105) 656
Profit/(loss) after tax – attributable to owners of Rio Tinto 11,552 10,058 12,392
Other comprehensive (loss)/income (3,374) 319 (1,897)
Total comprehensive income/(loss) [1] 8,200 10,272 11,151
Non-current assets 83,666 82,039  
Current assets 19,120 21,510  
Current liabilities (11,743) (12,743)  
Non-current liabilities (33,078) (34,465)  
Net assets/(liabilities) 57,965 56,341  
– attributable to non-controlling interests 2,719 1,755  
– attributable to Rio Tinto 55,246 54,586  
Cash flow from operations 15,599 15,160 16,134
Dividends paid to non-controlling interests (477) (462) $ (421)
Iron Ore Company of Canada      
Disclosure of subsidiaries [line items]      
Revenue 2,255 2,314  
Profit/(loss) after tax 321 445  
Profit/(loss) after tax – attributable to non-controlling interests 133 184  
Profit/(loss) after tax – attributable to owners of Rio Tinto 188 261  
Other comprehensive (loss)/income (205) 60  
Total comprehensive income/(loss) 116 505  
Non-current assets 2,987 3,170  
Current assets 711 866  
Current liabilities (541) (519)  
Non-current liabilities (937) (1,005)  
Net assets/(liabilities) 2,220 2,512  
– attributable to non-controlling interests 934 1,052  
– attributable to Rio Tinto 1,286 1,460  
Cash flow from operations 735 801  
Dividends paid to non-controlling interests (165) (103)  
Simfer Jersey      
Disclosure of subsidiaries [line items]      
Revenue 0 0  
Profit/(loss) after tax (25) (199)  
Profit/(loss) after tax – attributable to non-controlling interests (18) (114)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (7) (85)  
Other comprehensive (loss)/income 0 0  
Total comprehensive income/(loss) (25) (199)  
Non-current assets 2,908 789  
Current assets 545 83  
Current liabilities (402) (67)  
Non-current liabilities (45) (1,016)  
Net assets/(liabilities) 3,006 (211)  
– attributable to non-controlling interests 1,335 (130)  
– attributable to Rio Tinto 1,671 (81)  
Cash flow from operations (850) 262  
Dividends paid to non-controlling interests 0 0  
Oyu Tolgoi LLC      
Disclosure of subsidiaries [line items]      
Revenue 2,184 1,625  
Profit/(loss) after tax (1,077) (1,024)  
Profit/(loss) after tax – attributable to non-controlling interests (436) (352)  
Profit/(loss) after tax – attributable to owners of Rio Tinto (641) (672)  
Other comprehensive (loss)/income 0 0  
Total comprehensive income/(loss) (1,077) (1,024)  
Non-current assets 16,535 15,335  
Current assets 581 511  
Current liabilities (672) (4,920)  
Non-current liabilities (18,860) (12,544)  
Net assets/(liabilities) (2,416) (1,618)  
– attributable to non-controlling interests (994) (558)  
– attributable to Rio Tinto (1,422) (1,060)  
Cash flow from operations 1,039 345  
Dividends paid to non-controlling interests 0 0  
Robe River Mining Co Pty Ltd      
Disclosure of subsidiaries [line items]      
Revenue 1,746 1,753  
Profit/(loss) after tax 782 848  
Profit/(loss) after tax – attributable to non-controlling interests 313 339  
Profit/(loss) after tax – attributable to owners of Rio Tinto 469 509  
Other comprehensive (loss)/income (279) 40  
Total comprehensive income/(loss) 503 888  
Non-current assets 2,695 2,899  
Current assets 743 808  
Current liabilities (124) (157)  
Non-current liabilities (422) (443)  
Net assets/(liabilities) 2,892 3,107  
– attributable to non-controlling interests 1,153 1,241  
– attributable to Rio Tinto 1,739 1,866  
Cash flow from operations 1,274 1,480  
Dividends paid to non-controlling interests $ (282) $ (345)  
[1] Refer to the consolidated statement of comprehensive income for further details. Adjustments to other reserves include currency translation attributable to owners of Rio Tinto, other than that
arising on Rio Tinto Limited’s share capital.