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Net debt - Summary by currency, group's net debt, after taking into account relevant cross currency interest rate swaps and foreign exchange contracts (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts $ (13,001) $ (11,071)  
Lease liabilities (1,351) (1,200)  
Cash and cash equivalents 9,673 6,775 [1]  
Other investments 1,277 2,275  
Net debt (4,231) (4,188) $ 1,576
Foreign exchange risk      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts (13,000)    
Lease liabilities (1,351)    
Derivatives related to net debt (429)    
Cash and cash equivalents 9,672    
Other investments 877    
Net debt (4,231) (4,188)  
Foreign exchange risk | US dollar      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts (12,629)    
Lease liabilities (511)    
Derivatives related to net debt (429)    
Cash and cash equivalents 8,659    
Other investments 877    
Net debt (4,033) (3,929)  
Foreign exchange risk | Australian dollar      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts (200)    
Lease liabilities (433)    
Derivatives related to net debt 0    
Cash and cash equivalents 447    
Other investments 0    
Net debt (186) (455)  
Foreign exchange risk | Canadian dollar      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts (168)    
Lease liabilities (175)    
Derivatives related to net debt 0    
Cash and cash equivalents 96    
Other investments 0    
Net debt (247) (158)  
Foreign exchange risk | South African rand      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts 0    
Lease liabilities (2)    
Derivatives related to net debt 0    
Cash and cash equivalents 132    
Other investments 0    
Net debt 130 171  
Foreign exchange risk | Other      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts (3)    
Lease liabilities (230)    
Derivatives related to net debt 0    
Cash and cash equivalents 338    
Other investments 0    
Net debt $ 105 $ 183  
[1] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.