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Investments in equity accounted units - Summary of Investments in equity accounted units (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Investments in equity accounted units [Line Items]      
– Non-current assets $ 70,047 $ 76,554  
– Current assets 20,168 18,678  
Total assets 90,949 95,726  
– Non-current liabilities (30,261) (33,262)  
Total liabilities (41,126) (44,611)  
Rio Tinto's share of net assets 4,299 4,486  
Investment in equity accounted units [member]      
Disclosure of Investments in equity accounted units [Line Items]      
– Non-current assets 6,000 5,913  
– Current assets 887 990  
Total assets 6,887 6,903  
– Current liabilities (607) (654)  
– Non-current liabilities (1,981) (1,763)  
Total liabilities (2,588) (2,417)  
Rio Tinto's share of net assets $ 4,299 $ 4,486 $ 5,019