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Financial instruments and risk management - Fair value measurement - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Business combinations      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration payment period 10 years    
Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities £ 578 £ 416  
Movement in financial assets - other 22 30  
Zacapa put option | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 149 167 £ 174
Contingent consideration recognised on acquisition of businesses | Business combinations | Undiscounted amount      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 474    
Contingent consideration recognised on acquisition of businesses | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities £ 429 249 £ 227
Industrias Licoreras De Guatemala      
Disclosure of detailed information about financial instruments [line items]      
Proportion of ownership interest in investment by external party 50.00%    
Industrias Licoreras De Guatemala | Option exercised at 30 June 2023      
Disclosure of detailed information about financial instruments [line items]      
Increase (decrease) in fair value liability £ 4    
Industrias Licoreras De Guatemala | Zacapa put option | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities £ 149 £ 167