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Related party transactions - Amounts incurred by entity for provision of key management personnel services (Details) - GBP (£)
£ in Millions
 3 Months Ended 12 Months Ended
Aug. 09, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of transactions between related parties [line items]        
Salaries and short-term employee benefits   £ 9 £ 10 £ 10
Annual incentive plan   13 0 10
Non-Executive Directors’ fees   1 1 1
Share-based payments(i)   12 (11) 20
Post employment benefits   1 2 3
Termination benefits(ii)   2 2 0
Key management personnel remuneration   38 £ 4 £ 44
Termination benefits paid   1    
Key management personnel compensation that will be paid   £ 1    
Diageo Plc        
Disclosure of transactions between related parties [line items]        
Unlawful distribution £ 320