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Post employment benefits - Plan assets and liabilities by type of post employment benefit and country (Details) - GBP (£) £ in Millions | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
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Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | £ 594 | £ 1,165 | £ 447
Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 6,846 | 8,399 | 9,892
Plan liabilities |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (6,252) | (7,234) | £ (9,445)
Pensions | Plan assets | United Kingdom |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 4,578 | 6,041 |
Pensions | Plan assets | Ireland |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 1,588 | 1,645 |
Pensions | Plan assets | United States |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 441 | 453 |
Pensions | Plan assets | Other |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 180 | 191 |
Pensions | Plan liabilities | United Kingdom |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (4,041) | (4,897) |
Pensions | Plan liabilities | Ireland |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (1,310) | (1,409) |
Pensions | Plan liabilities | United States |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (411) | (408) |
Pensions | Plan liabilities | Other |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (194) | (212) |
Post employment medical | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 2 | 2 |
Post employment medical | Plan liabilities |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (227) | (225) |
Other post employment | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 57 | 67 |
Other post employment | Plan liabilities |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | £ (69) | £ (83) |

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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 deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_140_a&doctype=Standard -URIDate 2022-03-24 + Details
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