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Financial instruments and risk management - Movements in level 3 instruments measured on a recurring basis (Details) - Level 3 - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year £ 416  
At the end of the year 578 £ 416
Zacapa financial liability    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year 167 174
Net losses included in the income statement (7) (6)
Net gains/(losses) included in exchange in other comprehensive income 21 (5)
Net (losses)/gains included in retained earnings (2) 9
Acquisitions 0 0
Settlement of liabilities 6 9
At the end of the year 149 167
Contingent consideration payable    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year 249 227
Net losses included in the income statement (47) (24)
Net gains/(losses) included in exchange in other comprehensive income 31 (5)
Net (losses)/gains included in retained earnings 0 0
Acquisitions (253) (42)
Settlement of liabilities 89 49
At the end of the year 429 249
Casamigos acquisition | Contingent consideration payable    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the year 173  
At the end of the year 80 £ 173
Aviation Gin and Davos Brands | Contingent consideration payable    
Disclosure of fair value measurement of liabilities [line items]    
At the end of the year £ 177