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Financial instruments and risk management - Schedule of movements in level 3 instruments measured on a recurring basis (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Level 3    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year $ (665)  
At the end of the year (443) $ (665)
Zacapa financial liability | Level 3    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year (274) (261)
Net gains/(losses) included in the income statement 0 (10)
Net losses included in exchange in other comprehensive income 0 0
Net gains/(losses) included in retained earnings 73 (19)
Acquisitions 0 0
Settlement of liabilities 3 16
At the end of the year (198) (274)
Contingent consideration payable    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year (279)  
At the end of the year (153) (279)
Contingent consideration payable | Level 3    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year (391) (449)
Net gains/(losses) included in the income statement 145 145
Net losses included in exchange in other comprehensive income 0 (4)
Net gains/(losses) included in retained earnings 0 0
Acquisitions 0 (92)
Settlement of liabilities 1 9
At the end of the year $ (245) $ (391)