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Dividends and other reserves - Schedule of dividends (Details) - GBP (£) £ / shares in Units, £ in Millions | 6 Months Ended | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share Capital, Reserves And Other Equity Interest [Abstract] |  |  |  |
Final dividend for the year ended 30 June 2022 of 46.82 pence per share (2021 - 44.59 pence) | £ 1,066 | £ 1,040 |  |
Final dividend per share (in GBP per share) |  |  | £ 0.4682 | £ 0.4459

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- Definition The amount, per share, of final dividends as distribution to owners. + References No definition available. + Details
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- Definition Share Capital, Reserves And Other Equity Interest [Abstract] + References No definition available. + Details
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- Definition The amount of dividends relating to prior years, recognised as distributions to owners of the parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_106_d&doctype=Standard -URIDate 2022-03-24 + Details
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