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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts $ (12,442) $ (13,001)  
Lease liabilities (1,413) (1,351)  
Cash and cash equivalents 8,495 9,673  
Other investments 609 1,277  
Net debt (5,491) (4,231) $ (4,188)
Foreign exchange risk      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts (12,431)    
Lease liabilities (1,413)    
Derivatives related to net debt (343)    
Cash and cash equivalents 8,484    
Other investments 212    
Net debt (5,491) (4,231)  
Foreign exchange risk | US dollar      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts (12,181)    
Lease liabilities (539)    
Derivatives related to net debt (343)    
Cash and cash equivalents 7,108    
Other investments 212    
Net debt (5,743) (4,033)  
Foreign exchange risk | Australian dollar      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts (92)    
Lease liabilities (501)    
Derivatives related to net debt 0    
Cash and cash equivalents 721    
Other investments 0    
Net debt 128 (186)  
Foreign exchange risk | Canadian dollar      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts (158)    
Lease liabilities (158)    
Derivatives related to net debt 0    
Cash and cash equivalents 81    
Other investments 0    
Net debt (235) (247)  
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 167    
Other investments 0    
Net debt 165 130  
Foreign exchange risk | Other      
Disclosure of detailed information about financial instruments [line items]      
Borrowings excluding overdrafts 0    
Lease liabilities (213)    
Derivatives related to net debt 0    
Cash and cash equivalents 407    
Other investments 0    
Net debt $ 194 $ 105