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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, 2023
Dec. 31, 2022
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the period $ (665)  
At the end of the period (599) $ (690)
Zacapa financial liability    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the period (274) (261)
Net gains included in the income statement 8 0
Net losses included in exchange in other comprehensive income 0 (1)
Net gains/(losses) included in retained earnings 40 (5)
Acquisitions 0 0
Settlement of liabilities 2 7
At the end of the period (224) (260)
Contingent consideration recognised on acquisition of businesses    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the period (391) (449)
Net gains included in the income statement 15 15
Net losses included in exchange in other comprehensive income 0 0
Net gains/(losses) included in retained earnings 0 0
Acquisitions 0 (5)
Settlement of liabilities 1 9
At the end of the period $ (375) $ (430)