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Investments in equity accounted units - Summary of Investments in equity accounted units (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Investments in equity accounted units [Line Items]      
– Non-current assets $ 76,554 $ 74,177  
– Current assets 18,678 15,055  
Total assets 95,726 89,263  
– Current liabilities (11,225) (9,362)  
– Non-current liabilities (33,262) (34,133)  
Total liabilities (44,611) (43,533)  
Rio Tinto's share of net assets 4,486 5,019  
Investment in equity accounted units [member]      
Disclosure of Investments in equity accounted units [Line Items]      
– Non-current assets 5,913 6,686  
– Current assets 990 832  
Total assets 6,903 7,518  
– Current liabilities (654) (612)  
– Non-current liabilities (1,763) (1,887)  
Total liabilities (2,417) (2,499)  
Rio Tinto's share of net assets $ 4,486 $ 5,019 $ 4,941