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Equity - Schedule of movements in own shares (Details) - GBP (£) £ in Millions, shares in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended | 31 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2022 | Oct. 05, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020 | Feb. 11, 2022
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Beginning balance |  |  | £ (9,514) | £ (8,431) | £ (8,440) | £ (10,156) |
Ending balance | £ (9,514) |  |  | £ (9,514) | £ (8,431) | £ (8,440) |
Own shares |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Beginning balance (in shares) |  |  | 219 | 223 | 227 | 232 |
Beginning balance |  |  | £ 1,838 | £ 1,877 | £ 1,936 | £ 2,026 |
Ending balance (in shares) | 219 |  |  | 219 | 223 | 227 |
Ending balance | £ 1,838 |  |  | £ 1,838 | £ 1,877 | £ 1,936 |
Own shares | Share trust arrangements |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Increase (decrease) due to share based payment transactions (in shares) |  |  |  | (2) | (1) | (1) |
Increase (decrease) due to share based payment transactions |  |  |  | £ (23) | £ (11) | £ (7) |
Own shares | Shares used to satisfy options |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Increase (decrease) due to share based payment transactions (in shares) |  |  |  | (2) | (3) | (4) |
Increase (decrease) due to share based payment transactions |  |  |  | £ (16) | £ (48) | £ (83) |
Own shares | Share buyback programme |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Number of shares purchased - share buyback programme (in shares) |  |  |  | 61 | 3 | 39 |
Shares purchased - share buyback programme | £ 1,400 | £ 1,700 | £ 900 | £ 2,284 | £ 109 | £ 1,282 | £ 2,250
Shares cancelled (in shares) |  |  |  | (61) | (3) | (39) |
Shares cancelled |  |  |  | £ (2,284) | £ (109) | £ (1,282) |

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