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Equity - Own shares - Narrative (Details)
£ / shares in Units, $ / shares in Units, $ in Millions, £ in Billions
 4 Months Ended 12 Months Ended
Jun. 06, 2023
USD ($)
Jun. 06, 2023
GBP (£)
Jun. 30, 2024
USD ($)
£ / shares
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
£ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
£ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Sep. 28, 2023
£ / shares
shares
Disclosure of reserves within equity [line items]                  
Share capital     $ 887 $ 887 $ 898 [1] $ 898 [1] $ 875 [1] $ 875 [1]  
Number of shares authorised to be repurchased (in shares) | shares                 224,704,974
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                  
Disclosure of reserves within equity [line items]                  
Stock repurchase program, authorized amount $ 600 £ 0.5              
Share buyback programme | Diageo Plc                  
Disclosure of reserves within equity [line items]                  
Purchase of own shares       $ 987   $ 1,673   $ 2,985  
Number of shares purchased - share buyback programme (in shares) | shares       28,000,000   38,000,000   61,000,000  
Purchase of own shares percentage of issued ordinary share capital       1.10%   1.50%   2.40%  
Weighted average share price per share | (per share)     $ 29.18 $ 36.44 $ 36.16 $ 43.82 $ 37.09 $ 48.42  
Transaction costs           $ 16   $ 21  
Employee share trusts                  
Disclosure of reserves within equity [line items]                  
Number of shares outstanding (in shares) | shares     3,000,000 3,000,000 3,000,000 3,000,000 2,000,000 2,000,000  
Share capital     $ 66 $ 66 $ 66 $ 66 $ 30 $ 30  
Market value of shares outstanding     $ 97 $ 97 $ 127 $ 127 $ 76 $ 76  
[1] (1)  See pages 238-240 for an explanation under Accounting information and policies.