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Impairment charges - Summary of impairment charges (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge $ 0 $ (1,134)
Impairment charges of consolidated balances [1] 0 (1,015)
Impairment charges related to EAUs (pre-tax) 0 (148)
Total impairment charge 0 (1,163)
Taxation (including related to EAUs) 0 130
Total impairment in the income statement 0 (1,033)
Intangible assets    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge 0 (4)
Property, plant and equipment    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge 0 (1,011)
Investment in equity accounted units ('EAUs')    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge 0 (119)
Aluminium, Alumina and Bauxite | Pacific Aluminum    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge 0 (489)
Aluminium, Alumina and Bauxite | ISAL    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge 0 (204)
Minerals | Diavik    
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]    
Total impairment charge $ 0 $ (441)
[1] Refer to Impairment charges note on pages F-13 and F-14.