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Analysis of Net Debt - Component of Net Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Financial Assets and Liabilities [line items]        
Cash and cash equivalents (note 23) $ 5,783 $ 7,721 $ 4,218 $ 2,686
Interest-bearing loans and borrowings (note 24) (10,487) (12,215)    
Lease liabilities (note 20) (1,671) (1,635) (1,697)  
Derivative financial instruments (net) (note 25) 122 188 74  
Group net debt (6,253) (5,941) $ (7,532) $ (7,998)
Book Value [Member]        
Disclosure of Financial Assets and Liabilities [line items]        
Cash and cash equivalents (note 23) 5,783 7,721    
Interest-bearing loans and borrowings (note 24) (10,487) (12,215)    
Lease liabilities (note 20) (1,671) (1,635)    
Derivative financial instruments (net) (note 25) 122 188    
Group net debt (6,253) (5,941)    
Fair Value [Member]        
Disclosure of Financial Assets and Liabilities [line items]        
Cash and cash equivalents (note 23) 5,783 7,721    
Interest-bearing loans and borrowings (note 24) (11,340) (13,407)    
Lease liabilities (note 20) (1,671) (1,635)    
Derivative financial instruments (net) (note 25) 122 188    
Group net debt $ (7,106) $ (7,133)