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Post employment benefits - Analysis of fair value of plan assets (Details) - GBP (£) £ in Millions | Jun. 30, 2023 | Jun. 30, 2022
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Equities | £ 1,381 | £ 1,735
Property | 554 | 819
Hedge funds | 17 | 204
Interest rate and inflation swaps | (887) | (863)
Cash and other | 453 | 746
Total bid value of assets | 6,846 | 8,399
Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 104 | 319
Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 100 | 201
Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 605 | 703
Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 638 | 805
Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 623 | 1,380
Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 3,177 | 2,185
Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 81 | 165
Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 76 | 93
Property | 29 | 28
Hedge funds | 0 | 0
Interest rate and inflation swaps | 102 | 0
Cash and other | 51 | 31
Total bid value of assets | 2,741 | 2,687
Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 66 | 51
Quoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2 | 1
Quoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 21 | 25
Quoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 30 | 47
Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 13 | 11
Quoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2,351 | 2,400
Quoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 1,305 | 1,642
Property | 525 | 791
Hedge funds | 17 | 204
Interest rate and inflation swaps | (989) | (863)
Cash and other | 402 | 715
Total bid value of assets | 4,105 | 5,712
Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 38 | 268
Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 98 | 200
Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 584 | 678
Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 608 | 758
Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 610 | 1,369
Unquoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 826 | (215)
Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 81 | 165
United Kingdom | Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 12 | 23
Property | 29 | 28
Hedge funds | 0 | 0
Interest rate and inflation swaps | 0 | 0
Cash and other | 46 | 24
Total bid value of assets | 2,491 | 2,532
United Kingdom | Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 18 | 2
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 | 0
United Kingdom | Quoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 22 | 44
United Kingdom | Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 13 | 11
United Kingdom | Quoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2,351 | 2,400
United Kingdom | Quoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United Kingdom | Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 916 | 1,218
Property | 462 | 716
Hedge funds | 0 | 107
Interest rate and inflation swaps | (971) | (900)
Cash and other | (14) | 481
Total bid value of assets | 2,087 | 3,508
United Kingdom | Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 24 | 86
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 | 29 | 68
United Kingdom | Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 289 | 557
United Kingdom | Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 526 | 1,271
United Kingdom | Unquoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 826 | (215)
United Kingdom | Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 119
Ireland | Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 0 | 0
Property | 0 | 0
Hedge funds | 0 | 0
Interest rate and inflation swaps | 102 | 0
Cash and other | 5 | 7
Total bid value of assets | 113 | 9
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 | 6 | 2
Ireland | Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
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 | 291 | 319
Property | 62 | 74
Hedge funds | 12 | 92
Interest rate and inflation swaps | (18) | 37
Cash and other | 347 | 154
Total bid value of assets | 1,475 | 1,637
Ireland | Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 6 | 30
Ireland | Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 96 | 199
Ireland | Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 328 | 388
Ireland | Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 186 | 200
Ireland | Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 84 | 98
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 | 81 | 46
United States and Other | Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 64 | 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 | 137 | 146
United States and Other | Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 48 | 49
United States and Other | Quoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2 | 1
United States and Other | Quoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 21 | 25
United States and Other | Quoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2 | 1
United States and Other | Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States and Other | Quoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States and Other | Quoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States and Other | Unquoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 98 | 105
Property | 1 | 1
Hedge funds | 5 | 5
Interest rate and inflation swaps | 0 | 0
Cash and other | 69 | 80
Total bid value of assets | 543 | 567
United States and Other | Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 8 | 152
United States and Other | Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2 | 1
United States and Other | Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 227 | 222
United States and Other | Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 133 | 1
United States and Other | Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States and Other | Unquoted | Repurchase agreements |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
United States and Other | Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | £ 0 | £ 0

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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 2022-03-24 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_57_a&doctype=Standard -URIDate 2022-03-24 + Details
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