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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of associates [Line Items]      
Revenue $ 43,165 $ 40,522 $ 40,030
(Loss)/profit after tax 6,972 13,925 8,851
Other comprehensive loss 346 (3,139) 3,088
Total comprehensive income/(loss) 7,318 [1] 10,786 [1] $ 11,939
Non-current assets 70,499 70,047  
Current assets 17,303 20,168  
Non-current liabilities (31,435) (30,261)  
Net assets/(liabilities) 45,242 49,823  
Quasi equity loans to equity accounted units 113 129  
Boyne Smelters Limited      
Disclosure of associates [Line Items]      
Revenue 0 0  
(Loss)/profit after tax (7) (12)  
Other comprehensive loss (3) (68)  
Total comprehensive income/(loss) (10) (80)  
Non-current assets 1,229 1,268  
Current assets 96 93  
Current liabilities (114) (113)  
Non-current liabilities (814) (842)  
Net assets/(liabilities) 397 406  
Group's ownership interest 236 241  
Quasi equity loans to equity accounted units 113 129  
Carrying value of Group's interest $ 349 $ 370  
[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.