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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, 2022
GBP (£)
Sep. 30, 2020
GBP (£)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
GBP (£)
Disclosure of detailed information about business combination [line items]          
Cash transferred £ 358 £ 88     £ 27
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        
Deferred consideration payable          
Disclosure of detailed information about business combination [line items]          
Deferred/contingent consideration payable £ 2 4     £ 0
Other businesses acquired          
Disclosure of detailed information about business combination [line items]          
Cash transferred 95 26      
Deferred consideration paid for subsidiaries (1)        
Other businesses acquired | Deferred consideration payable          
Disclosure of detailed information about business combination [line items]          
Deferred/contingent consideration payable 2 4      
Maximum | Other businesses acquired          
Disclosure of detailed information about business combination [line items]          
Contingent consideration £ 86 £ 18      
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