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Principal joint ventures - Summary financial information for joint ventures by fair value (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of joint ventures [line items]      
Consolidated sales revenue $ 63,495 $ 44,611 $ 43,165
Depreciation and amortisation (4,697) (4,279) (4,384)
Finance expense (243) (268) (554)
Income tax (8,258) (4,991) (4,147)
Profit after tax for the year 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  
Cash and cash equivalents 12,807 10,381  
Minera Escondida Ltda      
Disclosure of joint ventures [line items]      
Consolidated sales revenue 9,783 7,650  
Depreciation and amortisation (1,160) (1,427)  
Impairment charges 0 0  
Other operating costs (3,066) (2,756)  
Operating profit/(loss) 5,557 3,467  
Finance expense (134) (137)  
Income tax (2,133) (1,197)  
Profit after tax for the year 3,290 2,133  
Other comprehensive (loss)/income 40 (40)  
Total comprehensive income/(loss) 3,330 2,093  
Non-current assets 11,490 11,833  
Current assets 2,857 3,107  
Current liabilities (2,017) (1,813)  
Non-current liabilities (4,633) (4,560)  
Net assets 7,697 8,567  
Cash and cash equivalents 857 1,103  
– current financial liabilities (550) (790)  
– non-current financial liabilities (2,660) (2,560)  
Dividends received from joint venture (Rio Tinto share) 1,374 585  
Sohar Aluminium Co. L.L.C.      
Disclosure of joint ventures [line items]      
Consolidated sales revenue 900 640  
Depreciation and amortisation (115) (115)  
Impairment charges 0 (1,100)  
Other operating costs (510) (430)  
Operating profit/(loss) 275 (1,005)  
Finance expense (30) (20)  
Income tax (35) (15)  
Profit after tax for the year 210 (1,040)  
Other comprehensive (loss)/income 0 0  
Total comprehensive income/(loss) 210 (1,040)  
Non-current assets 1,765 1,850  
Current assets 360 270  
Current liabilities (175) (675)  
Non-current liabilities (730) (200)  
Net assets 1,220 1,245  
Cash and cash equivalents 45 30  
– current financial liabilities (40) (565)  
– non-current financial liabilities (560) (30)  
Dividends received from joint venture (Rio Tinto share) $ 47 $ 0  
[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.