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Financial instruments and risk management - Fair value measurement - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Business combinations      
Disclosure of detailed information about financial instruments [line items]      
Contingent consideration payment period 8 years    
Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities £ 529 £ 587  
Movement in financial assets - other 8 46  
Zacapa put option | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 218 216 £ 149
Contingent consideration recognised on acquisition of businesses | Volume, measurement input      
Disclosure of detailed information about financial instruments [line items]      
Increase (decrease) in fair value liability due to increase in observable input £ 30    
Sensitivity analysis, percentage of possible increase in unobservable input, liabilities 10.00%    
Sensitivity analysis, percentage of possible decrease in unobservable input, liabilities 10.00%    
Increase (decrease) in fair value liability due to decrease in observable input £ (50)    
Contingent consideration recognised on acquisition of businesses | Cash flows, measurement input      
Disclosure of detailed information about financial instruments [line items]      
Increase (decrease) in fair value liability due to increase in observable input £ 25    
Sensitivity analysis, percentage of possible increase in unobservable input, liabilities 10.00%    
Sensitivity analysis, percentage of possible decrease in unobservable input, liabilities 10.00%    
Increase (decrease) in fair value liability due to decrease in observable input £ (25)    
Contingent consideration recognised on acquisition of businesses | Business combinations | Undiscounted amount      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 422    
Contingent consideration recognised on acquisition of businesses | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 311 371 £ 429
Contingent consideration recognised on acquisition of businesses | Level 3 | Aviation Gin and Davos Brands      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 113 157  
Contingent consideration recognised on acquisition of businesses | Level 3 | 21Seeds      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 59 59  
Contingent consideration recognised on acquisition of businesses | Level 3 | Lone River Ranch Water brand      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities 18 57  
Contingent consideration recognised on acquisition of businesses | Level 3 | Don Papa rum      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities £ 70 0  
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 2025      
Disclosure of detailed information about financial instruments [line items]      
Increase (decrease) in fair value liability due to increase in observable input £ 30    
Industrias Licoreras de Guatemala | Zacapa put option | Level 3      
Disclosure of detailed information about financial instruments [line items]      
Other financial liabilities £ 218 £ 216