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Impairment charges - Summary of impairment charges (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge $ (1,134) $ (2,349)
Taxation (including related to EAUs) 101  
Impairment charges, Non-controlling interests 0 1,506
Impairment charge, net amount (1,033) (859)
Impairment charges of consolidated balances [1] (1,015) (2,349)
Impairment charges related to EAUs (pre-tax) (148) 0
Total impairment charges in the financial information by business unit (1,163) (2,349)
Taxation (including related to EAUs) 130 (16)
Non-controlling interests 0 (1,506)
Impairment charge, net amount (1,033) (859)
Intangible assets    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge (4) (1)
Property, plant and equipment    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge (1,011) (2,348)
Investment in equity accounted units ('EAUs')    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge (119) 0
Aluminium, Alumina and Bauxite | Pacific Aluminum    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge (489) 0
Taxation (including related to EAUs) 17  
Impairment charges, Non-controlling interests 0  
Impairment charge, net amount (472)  
Non-controlling interests 0  
Impairment charge, net amount (472)  
Aluminium, Alumina and Bauxite | ISAL    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge (204) (109)
Taxation (including related to EAUs) (65)  
Impairment charges, Non-controlling interests 0  
Impairment charge, net amount (269)  
Non-controlling interests 0  
Impairment charge, net amount (269)  
Copper & Diamonds | Diavik    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge (441) 0
Taxation (including related to EAUs) 149  
Impairment charges, Non-controlling interests 0  
Impairment charge, net amount (292)  
Non-controlling interests 0  
Impairment charge, net amount (292)  
Copper & Diamonds | Oyu Tolgoi    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge 0 $ (2,240)
Taxation (including related to EAUs) 0  
Impairment charges, Non-controlling interests 0  
Impairment charge, net amount 0  
Non-controlling interests 0  
Impairment charge, net amount $ 0  
[1] Refer to Impairment charges note on pages F-12 and F-13.