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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, 2022 | Jun. 30, 2021 | Jun. 30, 2020
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Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | £ 1,165 | £ 447 | £ 365
Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 8,399 | 9,892 | 10,422
Plan liabilities |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (7,234) | (9,445) | £ (10,057)
Pensions | Plan assets | United Kingdom |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 6,041 | 7,341 |
Pensions | Plan assets | Ireland |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 1,645 | 1,826 |
Pensions | Plan assets | United States |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 453 | 470 |
Pensions | Plan assets | Other |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 191 | 186 |
Pensions | Plan liabilities | United Kingdom |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (4,897) | (6,580) |
Pensions | Plan liabilities | Ireland |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (1,409) | (1,926) |
Pensions | Plan liabilities | United States |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (408) | (373) |
Pensions | Plan liabilities | Other |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | (212) | (225) |
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 | (225) | (262) |
Other post employment | Plan assets |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | 67 | 67 |
Other post employment | Plan liabilities |  |  |
Disclosure of net defined benefit liability (asset) [line items] |  |  |
Plan asset and liabilities by type and country | £ (83) | £ (79) |

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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 2021-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_140_a&doctype=Standard -URIDate 2021-03-24 + Details
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