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Financial instruments - Movements in level 3 instruments measured on a recurring basis (Details) - Level 3 - USD ($)
$ in Millions
 6 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the period $ (443)  
At the end of the period (419) $ (599)
Zacapa financial liability    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the period (198) (274)
Net gains/(losses) included in the income statement 6 8
Net gains included in exchange in other comprehensive income 0 0
Net gains included in retained earnings 11 40
Settlement of liabilities 1 2
At the end of the period (180) (224)
Contingent consideration recognised on acquisition of businesses    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the period (245) (391)
Net gains/(losses) included in the income statement (2) 15
Net gains included in exchange in other comprehensive income 3 0
Net gains included in retained earnings 0 0
Settlement of liabilities 5 1
At the end of the period $ (239) $ (375)