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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 |
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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.

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