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Acquisition and sale of businesses and brands and purchase of non-controlling interests - Prior year acquisitions (Details)
£ in Millions, $ in Millions
12 Months Ended
Jun. 30, 2021
GBP (£)
transaction
instalment
Jun. 30, 2023
GBP (£)
Jun. 30, 2022
GBP (£)
Mar. 31, 2022
GBP (£)
Sep. 30, 2020
GBP (£)
Sep. 30, 2020
USD ($)
Disclosure of detailed information about business combination [line items]            
Cash transferred £ 358 £ 316 £ 88      
Number of transactions completed during the period, business combinations | transaction 3          
Number of transactions completed during the period including provisions for contingent consideration, business combination | instalment 2          
Other businesses acquired            
Disclosure of detailed information about business combination [line items]            
Cash transferred £ 95 98 26      
Deferred consideration paid for subsidiaries 1          
Maximum | Other businesses acquired            
Disclosure of detailed information about business combination [line items]            
Contingent consideration 86   18      
21Seeds            
Disclosure of detailed information about business combination [line items]            
Percentage of interest acquired       100.00%    
Cash transferred       £ 62    
21Seeds | Maximum            
Disclosure of detailed information about business combination [line items]            
Contingent consideration       £ 61    
Aviation Gin and Davos Brands            
Disclosure of detailed information about business combination [line items]            
Cash transferred         £ 263 $ 337
Aviation Gin and Davos Brands | Maximum            
Disclosure of detailed information about business combination [line items]            
Contingent consideration         £ 214 $ 275
Deferred consideration payable            
Disclosure of detailed information about business combination [line items]            
Deferred/contingent consideration payable 2 5 4      
Deferred consideration payable | Other businesses acquired            
Disclosure of detailed information about business combination [line items]            
Deferred/contingent consideration payable £ 2 £ 1 £ 4