v3.26.1
Equity - Own shares - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2024
USD ($)
£ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2026
£ / shares
Jun. 30, 2026
USD ($)
shares
Nov. 06, 2025
shares
Jun. 30, 2025
USD ($)
shares
Disclosure of reserves within equity [line items]            
Share capital $ 887 $ 887   $ 887   $ 887
Number of shares authorised to be repurchased (in shares) | shares         222,565,850  
Repurchase of shares percentage of market value per share to be paid upon purchase         105.00%  
Par value of shares authorised to be repurchased (in GBP per share) | £ / shares     £ 0.28935      
Share buyback programme | Diageo Plc            
Disclosure of reserves within equity [line items]            
Number of shares purchased - share buyback programme (in shares) | shares   28,000,000        
Purchase of own shares percentage of issued ordinary share capital   1.10%        
Purchase of own shares   $ 987        
Weighted average share price per share | (per share) $ 29.18 $ 36.44        
Employee share trusts            
Disclosure of reserves within equity [line items]            
Number of shares outstanding (in shares) | shares 3,000,000 3,000,000   2,000,000   3,000,000
Share capital $ 66 $ 66   $ 63   $ 62
Market value of shares outstanding $ 97 $ 97   $ 50   $ 73