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Intangible assets - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Period over which management has projected cash flows 5 years    
Deferred tax income £ 16 £ (134)  
Net exceptional loss (2,799) (1,454) £ (3,337)
Ketel One distribution right      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Other intangible assets £ 1,295 1,464 £ 1,418
Computer software | Maximum      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Useful life measured as period of time, intangible assets other than goodwill 8 years    
India | Goodwill | Brand and tangible asset impairment      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Impairment charge   655  
Old Tavern brand | Brand names | Brand and tangible asset impairment      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Impairment charge   78  
Bagpiper brand | Brand names | Brand and tangible asset impairment      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Impairment charge   38  
Old Tavern and Bagpiper brands | Brand names | Brand and tangible asset impairment      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Deferred tax income   25  
Windsor Premier brand | Brand names | Brand and tangible asset impairment      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Impairment charge   434  
Deferred tax income   105  
Net exceptional loss   £ 329  
India and USL Brands      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Extension of period over which management has projected cash flows 3 years    
Business combinations      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Period over which management has projected cash flows 5 years    
Extension of period over which management has projected cash flows 10 years