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Impairment charges - Impairment (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss $ (859) $ (98)
Aluminium    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss (86) (98)
Copper & Diamonds    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss (773) $ 0
Non-controlling interests    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 1,506  
Non-controlling interests | Aluminium    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 0  
Non-controlling interests | Copper & Diamonds    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 1,506  
Pre-tax    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss (2,349)  
Pre-tax | Aluminium    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss (109)  
Pre-tax | Copper & Diamonds    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss (2,240)  
Taxation    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss (16)  
Taxation | Aluminium    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 23  
Taxation | Copper & Diamonds    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss (39)  
Oyo Tolgoi Copper-Gold Mine | Pre-tax    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss 2,200  
Oyo Tolgoi Copper-Gold Mine | Taxation    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Impairment loss $ 2,300