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Equity - Schedule of employee share compensation (Details) - GBP (£) £ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Disclosure of fair value measurement of equity [line items]
Annual fair value charge of equity settled plans	£ 48	£ 59	£ 50
Equity-settled plans
Disclosure of fair value measurement of equity [line items]
Annual fair value charge of equity settled plans	49	59	49
Executive share award plans
Disclosure of fair value measurement of equity [line items]
Annual fair value charge of equity settled plans	41	51	41
Executive share option plans
Disclosure of fair value measurement of equity [line items]
Annual fair value charge of equity settled plans	4	4	4
Savings plans
Disclosure of fair value measurement of equity [line items]
Annual fair value charge of equity settled plans	£ 4	£ 4	£ 4

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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