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Investments in equity accounted units - Summary of Investments in equity accounted units (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Investments in equity accounted units [Line Items]      
Non-current assets $ 70,499 $ 70,047  
Current assets 17,303 20,168  
Total assets 87,802 90,949  
Non-current liabilities (31,435) (30,261)  
Total liabilities (42,560) (41,126)  
Rio Tinto's share of net assets 3,971 4,299  
Investment in equity accounted units [Member]      
Disclosure of Investments in equity accounted units [Line Items]      
Non-current assets 5,820 6,000  
Current assets 831 887  
Total assets 6,651 6,887  
Current liabilities (675) (607)  
Non-current liabilities (2,005) (1,981)  
Total liabilities (2,680) (2,588)  
Rio Tinto's share of net assets $ 3,971 $ 4,299 $ 4,486