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Other disclosures - Subsidiaries financial information (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disclosure of subsidiaries [line items]      
Revenue $ 33,083 $ 19,362  
Profit after tax for the period 13,068 3,451  
– attributable to non-controlling interests 755 135  
– attributable to Rio Tinto 12,313 3,316  
Other comprehensive loss 35 (1,141)  
Total comprehensive income 13,103 [1] 2,310 [2]  
Non-current assets 77,676   $ 76,535
Current assets 25,765   20,855
Current liabilities (12,076)   (11,607)
Non-current liabilities (33,196)   (33,880)
Net assets 58,169   51,903
– attributable to non-controlling interests 5,194   4,849
– attributable to Rio Tinto 52,975   47,054
Cash flow from operations 13,661 5,628  
Dividends paid to holders of non-controlling interests in subsidiaries (407) (215)  
Borrowings 12,405   12,653
Goodwill 945   946
Iron Ore Company of Canada      
Disclosure of subsidiaries [line items]      
Revenue 1,718 1,011  
Profit after tax for the period 654 257  
– attributable to non-controlling interests 271 106  
– attributable to Rio Tinto 383 151  
Other comprehensive loss 96 (91)  
Total comprehensive income 750 166  
Non-current assets 2,879   2,733
Current assets 840   670
Current liabilities (493)   (462)
Non-current liabilities (1,034)   (993)
Net assets 2,192   1,948
– attributable to non-controlling interests 907   804
– attributable to Rio Tinto 1,285   1,144
Cash flow from operations 964 403  
Dividends paid to holders of non-controlling interests in subsidiaries (206) 0  
Turquoise Hill      
Disclosure of subsidiaries [line items]      
Revenue 844 409  
Profit after tax for the period 426 (23)  
– attributable to non-controlling interests 211 (89)  
– attributable to Rio Tinto 215 66  
Other comprehensive loss 5 (2)  
Total comprehensive income 431 (25)  
Non-current assets 11,789   10,930
Current assets 1,033   1,496
Current liabilities (530)   (540)
Non-current liabilities (4,392)   (4,404)
Net assets 7,900   7,482
– attributable to non-controlling interests 2,600   2,424
– attributable to Rio Tinto 5,300   5,058
Cash flow from operations 95 29  
Dividends paid to holders of non-controlling interests in subsidiaries 0 0  
Robe River Mining Co Pty Ltd      
Disclosure of subsidiaries [line items]      
Revenue 1,289 734  
Profit after tax for the period 752 403  
– attributable to non-controlling interests 301 158  
– attributable to Rio Tinto 451 245  
Other comprehensive loss (80) (88)  
Total comprehensive income 672 315  
Non-current assets 3,535   3,452
Current assets 1,134   865
Current liabilities (583)   (380)
Non-current liabilities (424)   (255)
Net assets 3,662   3,682
– attributable to non-controlling interests 1,463   1,397
– attributable to Rio Tinto 2,199   2,285
Cash flow from operations 1,134 665  
Dividends paid to holders of non-controlling interests in subsidiaries (201) (211)  
Other Companies And Eliminations      
Disclosure of subsidiaries [line items]      
Revenue 1,504 851  
Profit after tax for the period 841 424  
– attributable to non-controlling interests 0 0  
– attributable to Rio Tinto 841 424  
Other comprehensive loss (37) (38)  
Total comprehensive income 804 386  
Non-current assets 4,238   4,247
Current assets 1,870   2,239
Current liabilities (339)   (414)
Non-current liabilities (4,234)   (4,752)
Net assets 1,535   1,320
– attributable to non-controlling interests 0   0
– attributable to Rio Tinto 1,535   1,320
Cash flow from operations 1,643 1,066  
Dividends paid to holders of non-controlling interests in subsidiaries 0 0  
Robe river iron associates      
Disclosure of subsidiaries [line items]      
Revenue 2,793 1,585  
Profit after tax for the period 1,593 827  
– attributable to non-controlling interests 301 158  
– attributable to Rio Tinto 1,292 669  
Other comprehensive loss (117) (126)  
Total comprehensive income 1,476 701  
Non-current assets 7,773   7,699
Current assets 3,004   3,104
Current liabilities (922)   (794)
Non-current liabilities (4,658)   (5,007)
Net assets 5,197   5,002
– attributable to non-controlling interests 1,463   1,397
– attributable to Rio Tinto 3,734   3,605
Cash flow from operations 2,777 1,731  
Dividends paid to holders of non-controlling interests in subsidiaries (201) $ (211)  
North Mining Limited | Robe river iron associates      
Disclosure of subsidiaries [line items]      
Goodwill 375   383
Amended and Restated Shareholders Agreement, Amended June 08, 2011 | Erdenes Oyu Tolgoi LLC      
Disclosure of subsidiaries [line items]      
Borrowings 1,399   1,378
Interest receivable $ 877   $ 804
Amended and Restated Shareholders Agreement, Amended June 08, 2011 | Erdenes Oyu Tolgoi LLC | Floating interest rate      
Disclosure of subsidiaries [line items]      
Borrowings, interest rate basis 6.50%    
[1] Refer to Group statement of comprehensive income for further details.
[2] Refer to Group statement of comprehensive income for further details.