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Principal associates - Summary information for joint ventures and associates that are not individually material to the group (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [Line Items]      
(Loss)/profit after tax $ 10,400 $ 6,972 $ 13,925
Other comprehensive income 2,584 346 (3,139)
Total comprehensive income/(loss) [1] 12,984 7,318 $ 10,786
Associates      
Disclosure of associates [Line Items]      
Carrying value of Group's interest 708 704  
(Loss)/profit after tax 0 3  
Other comprehensive income (5) 10  
Total comprehensive income/(loss) $ (5) $ 13  
[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.