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Post employment benefits - Schedule of charge before taxation (Details) - GBP (£) £ in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Charge before taxation | £ (31) | £ (29) | £ (87)
United Kingdom |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Charge before taxation | 15 | (27) | (46)
Ireland |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Charge before taxation | 1 | 45 | 4
United States |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Charge before taxation | (32) | (31) | (28)
Other |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Charge before taxation | £ (15) | £ (16) | £ (17)

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- 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. + Details
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- Definition The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_5&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_135_b&doctype=Standard -URIDate 2022-03-24 + Details
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