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Post employment benefits - Timing of benefit payments and average duration of defined benefit obligations and distribution of timing of benefit payments (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 0 | £ 0
United Kingdom |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 8,740 | £ 8,972
Average duration of the defined benefit obligation | 14 years | 15 years
United Kingdom | Within one year |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 303 | £ 295
United Kingdom | Between 1 to 5 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 1,090 | 1,082
United Kingdom | Between 6 to 15 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 2,439 | 2,556
United Kingdom | Between 16 to 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 2,244 | 2,252
United Kingdom | Beyond 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 2,664 | 2,787
Ireland |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 2,559 | £ 2,529
Average duration of the defined benefit obligation | 14 years | 15 years
Ireland | Within one year |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 73 | £ 70
Ireland | Between 1 to 5 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 367 | 353
Ireland | Between 6 to 15 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 727 | 704
Ireland | Between 16 to 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 645 | 634
Ireland | Beyond 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 747 | 768
United States |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 955 | £ 912
Average duration of the defined benefit obligation | 9 years | 9 years
United States | Within one year |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 57 | £ 58
United States | Between 1 to 5 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 174 | 187
United States | Between 6 to 15 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 331 | 310
United States | Between 16 to 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 206 | 183
United States | Beyond 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 187 | £ 174

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- Definition The amount of benefits paid or payable for retirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2022-03-24 -Paragraph 35 -Subparagraph b -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2022-en-r&anchor=para_35_b_v&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_147_c&doctype=Standard -URIDate 2022-03-24 + Details
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