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Post employment benefits - Analysis of fair value of plan assets (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Equities | $ 1,661 | $ 1,741
Property | 606 | 698
Hedge funds | 6 | 21
Interest rate and inflation swaps | (1,025) | (1,117)
Cash and other | 290 | 1,019
Total bid value of assets | 8,417 | 8,624
Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1,100 | 1,006
Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2,720 | 2,804
Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1,458 | 761
Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 949 | 802
Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 528 | 787
Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 124 | 102
Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 81 | 96
Property | 0 | 36
Hedge funds | 0 | 0
Interest rate and inflation swaps | 36 | 129
Cash and other | 48 | 134
Total bid value of assets | 3,312 | 2,561
Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1,005 | 799
Quoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2,112 | 1,288
Quoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 21 | 26
Quoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 9 | 36
Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 17
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 | 1,580 | 1,645
Property | 606 | 662
Hedge funds | 6 | 21
Interest rate and inflation swaps | (1,061) | (1,246)
Cash and other | 242 | 885
Total bid value of assets | 5,105 | 6,063
Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 95 | 207
Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 608 | 1,516
Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 1,437 | 735
Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 940 | 766
Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 528 | 770
Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 124 | 102
United Kingdom |  |
Disclosure of fair value of plan assets [line items] |  |
Pooled investment | 1,626 | 2,213
United Kingdom | Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 1 | 15
Property | 0 | 36
Hedge funds | 0 | 0
Interest rate and inflation swaps | 0 | 0
Cash and other | 20 | 128
Total bid value of assets | 3,080 | 2,248
United Kingdom | Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 943 | 739
United Kingdom | Quoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2,112 | 1,286
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 | 4 | 27
United Kingdom | Quoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 17
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 | 1,121 | 1,155
Property | 551 | 582
Hedge funds | 0 | 0
Interest rate and inflation swaps | (1,126) | (1,224)
Cash and other, amount contributed to fair value of plan assets |  | 363
Cash and other | 136 |
Total bid value of assets | 2,574 | 3,523
United Kingdom | Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 25 | 189
United Kingdom | Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 495 | 1,393
United Kingdom | Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 503 | 37
United Kingdom | Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 448 | 364
United Kingdom | Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 421 | 664
United Kingdom | Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 0
Ireland |  |
Disclosure of fair value of plan assets [line items] |  |
Pooled investment | 1,060 | 1,065
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 | 36 | 129
Cash and other | 28 | 6
Total bid value of assets | 69 | 142
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 | 5 | 7
Ireland | Quoted | Loan securities |  |
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 | 330 | 365
Property | 54 | 79
Hedge funds | 0 | 15
Interest rate and inflation swaps | 65 | (22)
Cash and other | 65 | 436
Total bid value of assets | 1,885 | 1,857
Ireland | Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 60 | 8
Ireland | Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 111 | 121
Ireland | Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 623 | 413
Ireland | Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 346 | 234
Ireland | Unquoted | Loan securities |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 107 | 106
Ireland | Unquoted | Liability Driven Investment (LDI) |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 124 | 102
United States and Other | Quoted |  |
Disclosure of fair value of plan assets [line items] |  |
Equities | 80 | 81
Property | 0 | 0
Hedge funds | 0 | 0
Interest rate and inflation swaps | 0 | 0
Cash and other | 0 | 0
Total bid value of assets | 163 | 171
United States and Other | Quoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 62 | 60
United States and Other | Quoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 2
United States and Other | Quoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 21 | 26
United States and Other | Quoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 0 | 2
United States and Other | Quoted | Loan securities |  |
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 | 129 | 125
Property | 1 | 1
Hedge funds | 6 | 6
Interest rate and inflation swaps | 0 | 0
Cash and other | 41 | 86
Total bid value of assets | 646 | 683
United States and Other | Unquoted | Fixed-interest government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 10 | 10
United States and Other | Unquoted | Inflation-linked government |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 2 | 2
United States and Other | Unquoted | Investment grade corporate |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 311 | 285
United States and Other | Unquoted | Non-investment grade |  |
Disclosure of fair value of plan assets [line items] |  |
Bonds | 146 | 168
United States and Other | Unquoted | Loan securities |  |
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
United States |  |
Disclosure of fair value of plan assets [line items] |  |
Pooled investment | $ 572 | $ 558

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