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Impairment charges net of reversals - Summary of impairment charges (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   $ (269) $ (1,243) $ (3,487)
Impairment charges, tax   72    
Impairment charges, non-controlling interests   0 0 1,506
Total impairment charges net of reversals in the income statement   (197) (1,115) (1,658)
Impairment charges of consolidated balances   (269) (904) (3,487)
Impairment charges related to EAUs (pre-tax)   0 (368) 0
Total impairment charges net of reversals   (269) (1,272) (3,487)
Taxation (including related to EAUs)   72 157 323
Intangible assets        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   0 (4) (1)
Property, plant and equipment        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   (269) (900) (3,486)
Investment in equity accounted units (“EAUs”)        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   0 (339) 0
Aluminium | Kitimat        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   (269) 0 0
Impairment charges, tax   72    
Impairment charges, non-controlling interests   0    
Total impairment charges net of reversals in the income statement   (197)    
Aluminium | Pacific Aluminium        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   0 (489) 0
Impairment charges, tax   0    
Impairment charges, non-controlling interests   0    
Total impairment charges net of reversals in the income statement   0    
Aluminium | Sohar        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   0 (220) 0
Impairment charges, tax   0    
Impairment charges, non-controlling interests   0    
Total impairment charges net of reversals in the income statement   0    
Aluminium | Sohar | Investment in equity accounted units (“EAUs”)        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Impairment charges of consolidated balances $ 220      
Aluminium | ISAL        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   0 (93) (109)
Impairment charges, tax   0    
Impairment charges, non-controlling interests   0    
Total impairment charges net of reversals in the income statement   0    
Aluminium | Yarwun Alumina Refinery        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   0 0 (1,138)
Impairment charges, tax   0    
Impairment charges, non-controlling interests   0    
Total impairment charges net of reversals in the income statement   0    
Minerals | Diavik        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   0 (441) 0
Impairment charges, tax   0    
Impairment charges, non-controlling interests   0    
Total impairment charges net of reversals in the income statement   0    
Copper | Oyu Tolgoi        
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items]        
Total impairment charges net of reversals   0 $ 0 $ (2,240)
Impairment charges, tax   0    
Impairment charges, non-controlling interests   0    
Total impairment charges net of reversals in the income statement   $ 0