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Impairment charges - Summary of impairment charges (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges $ (3,487) $ (132) $ (796)
Impairment charges, Tax 323 25 141
Impairment charges, Non-controlling interests 1,506 3 174
Impairment charge, net amount (1,658) (104) (481)
Intangible assets [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges (1) (2) (357)
Property, plant and equipment [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges (3,486) (130) (435)
Other assets and liabilities [member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges 0 0 (4)
Argyle Diamond Mine [member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges   0  
Copper & Diamonds [Member] | Oyu Tolgoi Llc [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges (2,240) 0 0
Impairment charges, Tax (39)    
Impairment charges, Non-controlling interests 1,506    
Impairment charge, net amount (773)    
Copper & Diamonds [Member] | Argyle Diamond Mine [member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges 0   (172)
Impairment charges, Tax 0    
Impairment charges, Non-controlling interests 0    
Impairment charge, net amount 0    
Aluminium [Member] | Yarwun Alumina Refinery [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges (1,138) 0 0
Impairment charges, Tax 339    
Impairment charges, Non-controlling interests 0    
Impairment charge, net amount (799)    
Aluminium [Member] | ISAL Smelter [Member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges (109) (123) 0
Impairment charges, Tax 23    
Impairment charges, Non-controlling interests 0    
Impairment charge, net amount (86)    
Energy & Minerals [Member] | Rossing [member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges 0 (9) (267)
Impairment charges, Tax 0    
Impairment charges, Non-controlling interests 0    
Impairment charge, net amount 0    
Energy & Minerals [Member] | Roughrider [member]      
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]      
Impairment charges 0 $ 0 $ (357)
Impairment charges, Tax 0    
Impairment charges, Non-controlling interests 0    
Impairment charge, net amount $ 0