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Property, plant and equipment - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment £ 6,142 £ 5,848 £ 4,849
Government grants 147 153  
Freeholds land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,481 1,444  
Long leasehold land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 3 3  
Short leasehold land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 389 410  
Fixtures and fittings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 55 47 35
Returnable bottles and crates      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 184 181 £ 157
Land      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment £ 141 £ 114  
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) 40 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