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Equity - Own shares - Narrative (Details) - GBP (£) £ / shares in Units, £ in Millions | 4 Months Ended | 7 Months Ended | 12 Months Ended | 42 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 06, 2023 | Feb. 03, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Feb. 03, 2023 | Oct. 06, 2022 | Sep. 30, 2021
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |
Share capital |  |  | £ 712 | £ 723 | £ 741 |  |  |
Number of shares authorised to be repurchased (in shares) |  |  |  |  |  |  | 227,870,414 |
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) |  |  |  |  |  |  |  | £ 0.28935
Share buyback programme |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount 2 | £ 500 |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  | £ 900 |  |  |  | £ 4,500 |  |
Share buyback programme | Diageo Plc |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |
Number of shares purchased - share buyback programme (in shares) |  |  | 38,000,000 | 61,000,000 | 3,000,000 |  |  |
Purchase of own shares percentage of issued ordinary share capital |  |  | 1.50% | 2.40% | 0.10% |  |  |
Weighted average share price per share (in GBP per share) |  |  | £ 36.16 | £ 37.09 | £ 34.07 |  |  |
Purchase of own shares |  |  | £ 1,381 | £ 2,284 | £ 109 |  |  |
Transaction costs |  |  | £ 13 | £ 16 | £ 1 |  |  |
Employee share trusts |  |  |  |  |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |  |  |  |  |
Number of shares outstanding (in shares) |  |  | 3,000,000 | 2,000,000 | 2,000,000 |  |  |
Share capital |  |  | £ 52 | £ 25 | £ 47 |  |  |
Market value of shares outstanding |  |  | £ 101 | £ 63 | £ 74 |  |  |

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