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Post employment benefits - Analysis of fair value of plan assets (Details) - GBP (£) £ in Millions | Jun. 30, 2022 | Jun. 30, 2021
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Equities | £ 1,735 | £ 1,088
Property | 819 | 758
Hedge funds | 204 | 244
Interest rate and inflation swaps | (863) | (886)
Cash and other | 746 | 678
Total bid value of assets | 8,399 | 9,892
Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 319 | 279
Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 201 | 239
Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 703 | 1,258
Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 805 | 280
Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1,380 | 2,068
Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2,185 | 3,608
Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 165 | 278
Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 93 | 72
Property | 28 | 0
Hedge funds | 0 | 0
Interest rate and inflation swaps | 0 | 0
Cash and other | 31 | 14
Total bid value of assets | 2,687 | 4,850
Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 51 | 133
Quoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1 | 0
Quoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 25 | 37
Quoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 47 | 21
Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 11 | 59
Quoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2,400 | 4,512
Quoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 2
Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 1,642 | 1,016
Property | 791 | 758
Hedge funds | 204 | 244
Interest rate and inflation swaps | (863) | (886)
Cash and other | 715 | 664
Total bid value of assets | 5,712 | 5,042
Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 268 | 146
Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 200 | 239
Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 678 | 1,221
Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 758 | 259
Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1,369 | 2,009
Unquoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | (215) | (904)
Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 165 | 276
United Kingdom | Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 23 | 0
Property | 28 | 0
Hedge funds | 0 | 0
Interest rate and inflation swaps | 0 | 0
Cash and other | 24 | 12
Total bid value of assets | 2,532 | 4,700
United Kingdom | Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2 | 86
United Kingdom | Quoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United Kingdom | Quoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 13
United Kingdom | Quoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 44 | 17
United Kingdom | Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 11 | 58
United Kingdom | Quoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2,400 | 4,512
United Kingdom | Quoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 2
United Kingdom | Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 1,218 | 604
Property | 716 | 685
Hedge funds | 107 | 101
Interest rate and inflation swaps | (900) | (994)
Cash and other | 481 | 514
Total bid value of assets | 3,508 | 2,641
United Kingdom | Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 86 | 61
United Kingdom | Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United Kingdom | Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 68 | 499
United Kingdom | Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 557 | 134
United Kingdom | Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1,271 | 1,731
United Kingdom | Unquoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | (215) | (904)
United Kingdom | Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 119 | 210
Ireland | Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 0 | 2
Property | 0 | 0
Hedge funds | 0 | 0
Interest rate and inflation swaps | 0 | 0
Cash and other | 7 | 2
Total bid value of assets | 9 | 7
Ireland | Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
Ireland | Quoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
Ireland | Quoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
Ireland | Quoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2 | 2
Ireland | Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 1
Ireland | Quoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
Ireland | Quoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
Ireland | Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 319 | 306
Property | 74 | 72
Hedge funds | 92 | 139
Interest rate and inflation swaps | 37 | 108
Cash and other | 154 | 60
Total bid value of assets | 1,637 | 1,819
Ireland | Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 30 | 81
Ireland | Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 199 | 239
Ireland | Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 388 | 355
Ireland | Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 200 | 115
Ireland | Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 98 | 278
Ireland | Unquoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
Ireland | Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 46 | 66
United States | Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 70 | 70
Property | 0 | 0
Hedge funds | 0 | 0
Interest rate and inflation swaps | 0 | 0
Cash and other | 0 | 0
Total bid value of assets | 146 | 143
United States | Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 49 | 47
United States | Quoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1 | 0
United States | Quoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 25 | 24
United States | Quoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1 | 2
United States | Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States | Quoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States | Quoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States | Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 105 | 106
Property | 1 | 1
Hedge funds | 5 | 4
Interest rate and inflation swaps | 0 | 0
Cash and other | 80 | 90
Total bid value of assets | 567 | 582
United States | Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 152 | 4
United States | Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1 | 0
United States | Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 222 | 367
United States | Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1 | 10
United States | Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States | Unquoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States | Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | £ 0 | £ 0

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- Definition The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_142_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount derivatives contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 142 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_142_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount instruments representing equity (rather than debt) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_142_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + Details
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