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Property, plant and equipment - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment £ 5,848 £ 4,849 £ 4,926
Government grants 153 133  
Deferred tax income (21) 16  
Net exceptional loss (3,338) (2,799) (1,454)
Nigerian tangible fixed assets impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment     84
Ethiopian tangible fixed assets impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment     55
Freeholds land and buildings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,444 1,218  
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 410 281  
Fixtures and fittings      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 47 35 41
Returnable bottles and crates      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 181 157 £ 180
Land      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment £ 114 £ 180  
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