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Principal associates - Reconciliation of financial information for principal associates by carrying value (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of associates [Line Items]      
Revenue $ 40,522 $ 40,030 $ 33,781
(Loss)/profit after tax 13,925 8,851 4,776
Other comprehensive (loss)/income (3,139) 3,088 (63)
Total comprehensive income for the year [1] 10,786 11,939 $ 4,713
– Non-current assets 70,047 76,554  
– Current assets 20,168 18,678  
– Non-current liabilities (30,261) (33,262)  
Net assets 49,823 51,115  
Net assets/(liabilities) 49,823 51,115  
Boyne Smelters Limited [member]      
Disclosure of associates [Line Items]      
(Loss)/profit after tax (12) 5  
Other comprehensive (loss)/income (68) 56  
Total comprehensive income for the year (80) 61  
– Non-current assets 1,268 1,468  
– Current assets 93 88  
– Current liabilities (113) (99)  
– Non-current liabilities (842) (996)  
Net assets $ 406 $ 461  
Group interest (%), Associate 59.40% 59.40%  
Net assets/(liabilities) $ 406 $ 461  
Group's ownership interest 241 274  
Quasi equity loans to equity accounted units 129 159  
Carrying value of Group's interest $ 370 $ 433  
[1] Refer to Group statement of comprehensive income for further details. Adjustments to other reserves include currency translation attributable to owners of Rio Tinto, other than that arising on Rio Tinto Limited’s share capital.