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Financial instruments - Movements in level 3 instruments measured on a recurring basis (Details) - Level 3 - GBP (£)
£ in Millions
 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the period £ (578)  
At the end of the period (483) £ (481)
Zacapa financial liability    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the period (149) (167)
Net (losses)/gains included in the income statement (7) 2
Net (losses)/gains included in exchange in other comprehensive income (4) 15
Net (losses)/gains included in retained earnings (12) 1
Acquisitions 0 0
Settlement of liabilities 3 1
At the end of the period (169) (148)
Contingent consideration recognised on acquisition of businesses    
Disclosure of fair value measurement of liabilities [line items]    
At the beginning of the period (429) (249)
Net (losses)/gains included in the income statement 18 (17)
Net (losses)/gains included in exchange in other comprehensive income (9) 27
Net (losses)/gains included in retained earnings 0 0
Acquisitions 0 (181)
Settlement of liabilities 106 87
At the end of the period (314) (333)
Contingent consideration recognised on acquisition of businesses | Casamigos Acquisition    
Disclosure of fair value measurement of liabilities [line items]    
At the end of the period 0 (80)
Contingent consideration recognised on acquisition of businesses | Aviation Gin and Davos Brands    
Disclosure of fair value measurement of liabilities [line items]    
At the end of the period (163) (172)
Contingent consideration recognised on acquisition of businesses | Lone River Ranch Water brand    
Disclosure of fair value measurement of liabilities [line items]    
At the end of the period £ (51) £ 0