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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, 2022 | Jun. 30, 2021
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 | £ 8,972 | £ 9,160
Average duration of the defined benefit obligation | 15 years | 18 years
United Kingdom | Within one year |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 295 | £ 288
United Kingdom | Between 1 to 5 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 1,082 | 1,112
United Kingdom | Between 6 to 15 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 2,556 | 2,606
United Kingdom | Between 16 to 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 2,252 | 2,314
United Kingdom | Beyond 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 2,787 | 2,840
Ireland |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 2,529 | £ 2,412
Average duration of the defined benefit obligation | 15 years | 18 years
Ireland | Within one year |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 70 | £ 84
Ireland | Between 1 to 5 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 353 | 338
Ireland | Between 6 to 15 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 704 | 656
Ireland | Between 16 to 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 634 | 588
Ireland | Beyond 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 768 | 746
United States |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 912 | £ 727
Average duration of the defined benefit obligation | 9 years | 11 years
United States | Within one year |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 58 | £ 52
United States | Between 1 to 5 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 187 | 145
United States | Between 6 to 15 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 310 | 247
United States | Between 16 to 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | 183 | 145
United States | Beyond 25 years |  |
Disclosure of defined benefit plans [line items] |  |
Benefits expected to be paid | £ 174 | £ 138

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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 2021-01-01 -Paragraph 35 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2021-en-r&anchor=para_35_b_v&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_147_c&doctype=Standard -URIDate 2021-03-24 + Details
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