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Dividends and other reserves - Schedule of dividends (Details) - GBP (£) £ / shares in Units, £ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Share Capital, Reserves And Other Equity Interest [Abstract]
Final dividend for the year ended 30 June 2021 of 44.59 pence per share (2020 - 42.47 pence)	£ 1,040	£ 992
Final dividend per share (in GBP per share)			£ 0.4459	£ 0.4247

X

- Definition

The amount, per share, of final dividends as distribution to owners.

+ References

No definition available.

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- Definition

Share Capital, Reserves And Other Equity Interest [Abstract]

+ References

No definition available.

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X

- 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 2021-01-01
-Paragraph 106
-Subparagraph d
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-URIDate 2021-03-24

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