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Acquisition and sale of businesses and brands and purchase of non-controlling interests - Assets and liabilities held for sale, narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 03, 2025
Jul. 01, 2025
Sep. 30, 2024
Jun. 30, 2025
Apr. 02, 2025
Jun. 11, 2024
Seychelles Breweries Limited            
Disclosure Of Assets and Liabilities Held For Sale [Line Items]            
Disposal, percentage of interest disposed         54.40%  
Seychelles Breweries Limited | Disposal of major subsidiary [member]            
Disclosure Of Assets and Liabilities Held For Sale [Line Items]            
Consideration paid (received)   $ (80)        
Guinness Ghana Breweries Plc            
Disclosure Of Assets and Liabilities Held For Sale [Line Items]            
Impairment loss       $ 97    
Disposal, exchange losses expected to be recycled to the Income Statement       $ 70    
Guinness Ghana Breweries Plc | Disposal of major subsidiary [member]            
Disclosure Of Assets and Liabilities Held For Sale [Line Items]            
Consideration paid (received) $ (81)          
Guinness Nigeria plc            
Disclosure Of Assets and Liabilities Held For Sale [Line Items]            
Consideration paid (received)     $ (64)      
Disposal, percentage of interest disposed           58.02%