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Principal associates - Reconciliation of financial information for principal associates by carrying value (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of associates [Line Items]      
Consolidated sales revenue $ 63,495 $ 44,611 $ 43,165
Profit after tax 22,575 10,400 6,972
Other comprehensive (loss)/income (1,270) 2,584 346
Total comprehensive income/(loss) [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  
Loans to equity accounted units 97 112  
Impairment charges of consolidated balances 269 904 $ 3,487
Boyne Smelters Limited      
Disclosure of associates [Line Items]      
Consolidated sales revenue 0 0  
Profit after tax 61 (198)  
Other comprehensive (loss)/income (24) 30  
Total comprehensive income/(loss) 37 (168)  
Non-current assets 993 1,037  
Current assets 135 98  
Current liabilities (195) (146)  
Non-current liabilities (675) (779)  
Net assets 258 210  
Group's ownership interest 153 125  
Loans to equity accounted units 97 112  
Carrying value of Group's interest $ 250 237  
Impairment charges of consolidated balances   $ 200  
[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.