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Principal subsidiaries - Subsidiaries financial information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]      
Consolidated sales revenue $ 63,495 $ 44,611 $ 43,165
Profit after tax for the year 22,575 10,400 6,972
Profit/(loss) after tax – attributable to non-controlling interests 1,481 631 (1,038)
Profit/(loss) after tax – attributable to owners of Rio Tinto 21,094 9,769 8,010
Other comprehensive (loss)/income (1,270) 2,584 346
Total comprehensive income [1] 21,305 12,984 7,318
Non-current assets 78,464 76,535  
Current assets 24,432 20,855  
Non-current liabilities (33,679) (33,880)  
Net assets 56,590 51,903  
Attributable to non-controlling interests 5,158 4,849  
– attributable to Rio Tinto 51,432 47,054  
Cash flow from operations 25,345 15,875 14,912
Dividends paid to non-controlling interests (1,090) (683) (376)
Borrowings 13,531 13,831  
Goodwill 879 946 $ 922
Iron Ore Company of Canada      
Disclosure of subsidiaries [line items]      
Consolidated sales revenue 3,308 2,269  
Profit after tax for the year 1,193 611  
Profit/(loss) after tax – attributable to non-controlling interests 493 252  
Profit/(loss) after tax – attributable to owners of Rio Tinto 700 359  
Other comprehensive (loss)/income 39 56  
Total comprehensive income 1,232 667  
Non-current assets 2,974 2,733  
Current assets 599 670  
Current liabilities (581) (462)  
Non-current liabilities (1,020) (993)  
Net assets 1,972 1,948  
Attributable to non-controlling interests 818 804  
– attributable to Rio Tinto 1,154 1,144  
Cash flow from operations 2,119 1,027  
Dividends paid to non-controlling interests (495) (180)  
Turquoise Hill      
Disclosure of subsidiaries [line items]      
Consolidated sales revenue 1,971 1,078  
Profit after tax for the year 893 357  
Profit/(loss) after tax – attributable to non-controlling interests 496 130  
Profit/(loss) after tax – attributable to owners of Rio Tinto 397 227  
Other comprehensive (loss)/income 3 2  
Total comprehensive income 896 359  
Non-current assets 12,250 10,930  
Current assets 1,129 1,496  
Current liabilities (954) (540)  
Non-current liabilities (4,085) (4,404)  
Net assets 8,340 7,482  
Attributable to non-controlling interests 2,846 2,424  
– attributable to Rio Tinto 5,494 5,058  
Cash flow from operations 825 380  
Dividends paid to non-controlling interests 0 0  
Erdenes Oyu Tolgoi LLC | Amended and restated shareholders agreement      
Disclosure of subsidiaries [line items]      
Borrowings 1,399 1,378  
Interest receivable $ 953 804  
Erdenes Oyu Tolgoi LLC | Floating interest rate      
Disclosure of subsidiaries [line items]      
Borrowings, interest rate basis 6.50%    
Erdenes Oyu Tolgoi LLC | Floating interest rate | Amended and restated shareholders agreement      
Disclosure of subsidiaries [line items]      
Borrowings, interest rate basis 6.50%    
Robe River Mining Co Pty Ltd      
Disclosure of subsidiaries [line items]      
Consolidated sales revenue $ 2,454 1,738  
Profit after tax for the year 1,352 939  
Profit/(loss) after tax – attributable to non-controlling interests 541 376  
Profit/(loss) after tax – attributable to owners of Rio Tinto 811 563  
Other comprehensive (loss)/income (183) 294  
Total comprehensive income 1,169 1,233  
Non-current assets 3,472 3,452  
Current assets 495 865  
Current liabilities (371) (380)  
Non-current liabilities (421) (255)  
Net assets 3,175 3,682  
Attributable to non-controlling interests 1,268 1,397  
– attributable to Rio Tinto 1,907 2,285  
Cash flow from operations 2,130 1,491  
Dividends paid to non-controlling interests (589) (332)  
Other companies and eliminations      
Disclosure of subsidiaries [line items]      
Consolidated sales revenue 2,863 2,028  
Profit after tax for the year 1,518 1,019  
Profit/(loss) after tax – attributable to non-controlling interests 0 0  
Profit/(loss) after tax – attributable to owners of Rio Tinto 1,518 1,019  
Other comprehensive (loss)/income (97) 136  
Total comprehensive income 1,421 1,155  
Non-current assets 4,166 4,247  
Current assets 2,118 2,239  
Current liabilities (329) (414)  
Non-current liabilities (4,378) (4,752)  
Net assets 1,577 1,320  
Attributable to non-controlling interests 0 0  
– attributable to Rio Tinto 1,577 1,320  
Cash flow from operations 2,512 1,771  
Dividends paid to non-controlling interests 0 (165)  
Robe River      
Disclosure of subsidiaries [line items]      
Consolidated sales revenue 5,317 3,766  
Profit after tax for the year 2,870 1,958  
Profit/(loss) after tax – attributable to non-controlling interests 541 376  
Profit/(loss) after tax – attributable to owners of Rio Tinto 2,329 1,582  
Other comprehensive (loss)/income (280) 430  
Total comprehensive income 2,590 2,388  
Non-current assets 7,638 7,699  
Current assets 2,613 3,104  
Current liabilities (700) (794)  
Non-current liabilities (4,799) (5,007)  
Net assets 4,752 5,002  
Attributable to non-controlling interests 1,268 1,397  
– attributable to Rio Tinto 3,484 3,605  
Cash flow from operations 4,642 3,262  
Dividends paid to non-controlling interests (589) (497)  
North Mining Limited | Robe River      
Disclosure of subsidiaries [line items]      
Goodwill $ 362 $ 383  
[1] Refer to Group 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.