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Financial Assets - Summary of Investments Accounted for Using Equity Method (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of analysis of single amount of discontinued operations [line items]      
Group profit for the financial year $ 2,621 $ 1,165 $ 1,738
Impairment loss on equity method investments in associates 0 827 8
Europe materials [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Impairment loss on equity method investments in associates   $ 154  
Discount rate applied to the cash flow projections (real pre-tax)   9.20%  
Associates [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Group profit for the financial year 44 $ (140) 21
Joint ventures [member]      
Disclosure of analysis of single amount of discontinued operations [line items]      
Group profit for the financial year $ 11 $ 22 $ 46