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Investments in equity accounted units - Summary of Investments in equity accounted units (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Investments in equity accounted units [Line Items]      
– Non-current assets $ 78,464 $ 76,535  
Current assets 24,432 20,855  
Total assets 102,896 97,390  
Non-current liabilities (33,679) (33,880)  
Total liabilities (46,306) (45,487)  
Rio Tinto's share of net assets 3,504 3,764  
Investment in equity accounted units      
Disclosure of Investments in equity accounted units [Line Items]      
– Non-current assets 5,139 5,307  
Current assets 1,063 1,077  
Total assets 6,202 6,384  
Current liabilities (788) (785)  
Non-current liabilities (1,910) (1,835)  
Total liabilities (2,698) (2,620)  
Rio Tinto's share of net assets $ 3,504 $ 3,764 $ 3,971