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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of joint ventures [line items]      
Consolidated sales revenue $ 44,611 $ 43,165 $ 40,522
Depreciation and amortisation (4,279) (4,384) (4,015)
Finance costs (268) (554) (552)
Taxation (4,991) (4,147) (4,242)
Profit after tax for the year 10,400 6,972 13,925
Other comprehensive income/(loss) 2,584 346 (3,139)
Total comprehensive income/(loss) [1] 12,984 7,318 $ 10,786
Non-current assets 76,535 70,499  
Current assets 20,855 17,303  
Non-current liabilities (33,880) (31,435)  
Net assets 51,903 45,242  
Cash and cash equivalents 10,381 8,027  
Minera Escondida Limitada      
Disclosure of joint ventures [line items]      
Consolidated sales revenue 7,650 7,120  
Depreciation and amortisation (1,427) (1,693)  
Impairment charges 0 0  
Other operating costs (2,756) (3,670)  
Operating profit/(loss) 3,467 1,757  
Finance costs (137) (157)  
Taxation (1,197) (627)  
Profit after tax for the year 2,133 973  
Other comprehensive income/(loss) (40) (17)  
Total comprehensive income/(loss) 2,093 956  
Non-current assets 11,833 12,450  
Current assets 3,107 2,250  
Current liabilities (1,813) (1,827)  
Non-current liabilities (4,560) (4,670)  
Net assets 8,567 8,203  
Cash and cash equivalents 1,103 603  
– current financial liabilities (790) (807)  
– non-current financial liabilities (2,560) (2,380)  
Dividends received from joint venture (Rio Tinto share) 585 666  
Sohar      
Disclosure of joint ventures [line items]      
Consolidated sales revenue 640 715  
Depreciation and amortisation (115) (115)  
Impairment charges (1,100) 0  
Other operating costs (430) (505)  
Operating profit/(loss) (1,005) 95  
Finance costs (20) (35)  
Taxation (15) (10)  
Profit after tax for the year (1,040) 50  
Other comprehensive income/(loss) 0 0  
Total comprehensive income/(loss) (1,040) 50  
Non-current assets 1,850 3,045  
Current assets 270 290  
Current liabilities (675) (205)  
Non-current liabilities (200) (845)  
Net assets 1,245 2,285  
Cash and cash equivalents 30 20  
– current financial liabilities (565) (110)  
– non-current financial liabilities (30) (675)  
Dividends received from joint venture (Rio Tinto share) $ 0 $ 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.