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Equity - Employee share compensation - Narrative (Details)
shares in Millions
12 Months Ended
Jun. 30, 2024
shares
£ / shares
Jun. 30, 2023
£ / shares
Jun. 30, 2022
£ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of executive share options exercisable (in shares) | shares 3.3    
Exercise price of executive share options exercisable (in GBP per share) £ 26.39    
Weighted average remaining contractual life of outstanding share options 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) £ 17.09 £ 17.09 £ 17.04
Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Exercise price of outstanding share options (in GBP per share) £ 38.54 £ 38.64 £ 40.24
Diageo Long Term Incentive Plan | 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 | 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 | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Maximum target level share options plan 100.00%    
Savings Plans | Minimum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Period over which savings plans are deducted from net pay 3 years    
Savings Plans | Maximum      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Period over which savings plans are deducted from net pay 5 years    
Savings plans in UK and ROI      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Discount of option price 20.00%    
Savings Plans in US      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Discount of option price 15.00%    
Compound annual growth in profit before exceptional items over three years | Diageo Long Term Incentive Plan      
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      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weight of performance target 40.00%    
Environmental, social and governance priorities | Diageo Long Term Incentive Plan      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weight of performance target 20.00%