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Investments in equity accounted units - Summary of Investments in equity accounted units (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Investments in equity accounted units [Line Items]      
Non-current assets $ 76,535 $ 70,499  
Current assets 20,855 17,303  
Total assets 97,390 87,802  
Non-current liabilities (33,880) (31,435)  
Total liabilities (45,487) (42,560)  
Rio Tinto's share of net assets 3,764 3,971  
Investment in equity accounted units      
Disclosure of Investments in equity accounted units [Line Items]      
Non-current assets 5,307 5,820  
Current assets 1,077 831  
Total assets 6,384 6,651  
Current liabilities (785) (675)  
Non-current liabilities (1,835) (2,005)  
Total liabilities (2,620) (2,680)  
Rio Tinto's share of net assets $ 3,764 $ 3,971 $ 4,299