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Contingent liabilities and legal proceedings - Tax (Details)
£ in Millions, $ in Millions
12 Months Ended
Jun. 30, 2021
GBP (£)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
GBP (£)
Jun. 30, 2021
USD ($)
Disclosure of contingent liabilities [line items]            
Impact on income statement gain/(loss) £ 2,799   £ 1,454   £ 3,337  
Maximum | Tax contingent liability            
Disclosure of contingent liabilities [line items]            
Potential liability 277          
Brazil | Maximum | Tax contingent liability            
Disclosure of contingent liabilities [line items]            
Potential liability 449          
India            
Disclosure of contingent liabilities [line items]            
Receivable for protest payments 106          
Receivable for protest payments, corporate taxes 96          
Receivable for protest payments, indirect taxes 10          
India | Maximum | Tax contingent liability            
Disclosure of contingent liabilities [line items]            
Potential liability 140          
Contingent assets substitution drawback | Diageo Americas Supply Inc            
Disclosure of contingent liabilities [line items]            
Impact on income statement gain/(loss) (94) $ (129)        
Payment received 68 $ 96 £ 26 $ 33    
Estimated current eligible claim £ 8         $ 12