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Property, plant and equipment - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment £ 4,849 £ 4,926 £ 4,455
Government grants 133 150  
Deferred tax income 16 (134)  
Net exceptional loss (2,799) (1,454) (3,337)
Nigerian tangible fixed assets impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment   84  
Deferred tax income   25  
Net exceptional loss   59  
Ethiopian tangible fixed assets impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment   55  
Deferred tax income   10  
Net exceptional loss   45  
Freeholds land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,218 1,218  
Long leasehold land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 3 6  
Short leasehold land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 281 320  
Fixtures and fittings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 35 41 34
Returnable bottles and crates      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 157 180 £ 176
Land      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment £ 180 £ 161  
Minimum | Buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 10 years    
Minimum | Casks and containers      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 15 years    
Minimum | Other plant and equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 5 years    
Minimum | Fixtures and fittings      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 5 years    
Minimum | Returnable bottles and crates      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 5 years    
Maximum | Buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 50 years    
Maximum | Casks and containers      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 50 years    
Maximum | Other plant and equipment      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 25 years    
Maximum | Fixtures and fittings      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 10 years    
Maximum | Returnable bottles and crates      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful life (in years) 10 years