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Financial instruments and risk management - 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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Total borrowings $ (14,115) $ (12,752)  
Cash and cash equivalents 8,027 10,773  
Other investments 2,839 2,782  
Net cash/(debt) (3,651) 255 $ (3,845)
Foreign exchange risk      
Disclosure of detailed information about financial instruments [line items]      
Total borrowings (12,806)    
Lease liabilities (1,309)    
Derivatives related to net debt: designated as hedges (147)    
Cash and cash equivalents 8,027    
Other investments 2,584    
Net cash/(debt) (3,651) 255  
Foreign exchange risk | US Dollars      
Disclosure of detailed information about financial instruments [line items]      
Total borrowings (12,233)    
Lease liabilities (503)    
Derivatives related to net debt: designated as hedges (147)    
Cash and cash equivalents 7,456    
Other investments 2,584    
Net cash/(debt) (2,843) 464  
Foreign exchange risk | Australian dollar      
Disclosure of detailed information about financial instruments [line items]      
Total borrowings (382)    
Lease liabilities (349)    
Cash and cash equivalents 170    
Net cash/(debt) (561) (255)  
Foreign exchange risk | Euro      
Disclosure of detailed information about financial instruments [line items]      
Total borrowings (4)    
Lease liabilities (23)    
Cash and cash equivalents 37    
Net cash/(debt) 10 (22)  
Foreign exchange risk | South African rand      
Disclosure of detailed information about financial instruments [line items]      
Lease liabilities (2)    
Cash and cash equivalents 173    
Net cash/(debt) 171 95  
Foreign exchange risk | Canadian dollar      
Disclosure of detailed information about financial instruments [line items]      
Total borrowings (185)    
Lease liabilities (154)    
Cash and cash equivalents 17    
Net cash/(debt) (322) (134)  
Foreign exchange risk | Other currencies      
Disclosure of detailed information about financial instruments [line items]      
Total borrowings (2)    
Lease liabilities (278)    
Cash and cash equivalents 174    
Net cash/(debt) $ (106) $ 107