v3.26.1
Equity - Employee share compensation - Narrative (Details)
shares in Millions
12 Months Ended
Jun. 30, 2026
shares
£ / shares
Jun. 30, 2025
shares
£ / shares
Jun. 30, 2024
shares
£ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of executive share options exercisable (in shares) | shares 3.6 4.6 3.3
Exercise price of executive share options exercisable (in GBP per share) £ 28.85 £ 25.12 £ 26.39
Weighted average remaining contractual life of outstanding share options 6 years 6 years 6 years
Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercise price of outstanding share options (in GBP per share) £ 14.66 £ 17.09 £ 17.09
Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercise price of outstanding share options (in GBP per share) £ 37.63 £ 37.63 £ 38.54
Diageo Long Term Incentive Plan 2025 | Minimum | Executive Directors      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting range share options plan 20.00%    
Diageo Long Term Incentive Plan 2025 | Minimum | Other Participant      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Vesting range share options plan 25.00%    
Diageo Long Term Incentive Plan 2025 | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Maximum target level share options plan 100.00%    
Compound annual growth in profit before exceptional items over three years | Diageo Long Term Incentive Plan 2023/2024      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weight of performance target 40.00%    
Compound annual growth in profit before exceptional items over three years | Diageo Long Term Incentive Plan 2025      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weight of performance target 28.30%    
Compound annual growth in organic net sales over three years | Diageo Long Term Incentive Plan 2023/2024      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weight of performance target 40.00%    
Compound annual growth in organic net sales over three years | Diageo Long Term Incentive Plan 2025      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weight of performance target 28.30%    
Environmental, social and governance priorities | Diageo Long Term Incentive Plan 2023/2024      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weight of performance target 20.00%    
Environmental, social and governance priorities | Diageo Long Term Incentive Plan 2025      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weight of performance target 15.00%    
Adjusted return on invested capital | Diageo Long Term Incentive Plan 2025      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weight of performance target 28.30%