v3.25.4
Sale of businesses - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2025
Jul. 03, 2025
Jul. 01, 2025
Dec. 31, 2025
Dec. 31, 2024
Disclosure of business disposal [line items]          
Non-operating items       $ 7 $ (54)
Diageo Operations Italy S.p.A          
Disclosure of business disposal [line items]          
Cash received $ 120        
Decrease through loss of control of subsidiary, property, plant and equipment $ (144)        
Non-operating items       (6)  
Exchange recycled from other comprehensive income       (6)  
Seychelles Breweries Limited (6)          
Disclosure of business disposal [line items]          
Cash received     $ 89    
Decrease through loss of control of subsidiary, property, plant and equipment     $ (32)    
Non-operating items       62  
Exchange recycled from other comprehensive income       (8)  
Guinness Ghana Breweries PLC (7)          
Disclosure of business disposal [line items]          
Cash received   $ 81      
Decrease through loss of control of subsidiary, property, plant and equipment   $ (64)      
Non-operating items       (49)  
Exchange recycled from other comprehensive income       (94)  
Hyperinflationary adjustment recycled from other comprehensive income       $ 22