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Equity - Schedule of movements in own shares (Details) - GBP (£) £ in Millions, shares in Millions | 12 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | £ (9,514) | £ (8,431) | £ (8,440)
Ending balance | £ (9,292) | £ (9,514) | £ (8,431)
Own shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance (in shares) | 219 | 223 | 227
Beginning balance | £ 1,838 | £ 1,877 | £ 1,936
Ending balance (in shares) | 216 | 219 | 223
Ending balance | £ 1,814 | £ 1,838 | £ 1,877
Own shares | Share trust arrangements |  |  |
Disclosure of classes of share capital [line items] |  |  |
Increase (decrease) due to share based payment transactions (in shares) | (1) | (2) | (1)
Increase (decrease) due to share based payment transactions | £ (12) | £ (23) | £ (11)
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) | (2) | (3)
Increase (decrease) due to share based payment transactions | £ (12) | £ (16) | £ (48)
Own shares | Share buyback programme |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares purchased - share buyback programme (in shares) | 38 | 61 | 3
Shares purchased - share buyback programme | £ 1,381 | £ 2,284 | £ 109
Shares cancelled (in shares) | (38) | (61) | (3)
Shares cancelled | £ (1,381) | £ (2,284) | £ (109)

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