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Net borrowings - Bonds issued and repaid (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Schedule of bonds issued and repaid [line items] |  |  |  |  |
Repaid | $ (1,667) | $ (1,650) | [1] | $ (2,060) | [1]
Bonds issued and repaid | 558 | 887 |  | 911 |
€ denominated |  |  |  |  |
Schedule of bonds issued and repaid [line items] |  |  |  |  |
Issued | 535 | 548 |  | 1,800 |
Repaid | (1,167) | 0 |  | (1,060) |
£ denominated |  |  |  |  |
Schedule of bonds issued and repaid [line items] |  |  |  |  |
Issued | 0 | 0 |  | 1,171 |
$ denominated |  |  |  |  |
Schedule of bonds issued and repaid [line items] |  |  |  |  |
Issued | 1,690 | 1,989 |  | 0 |
Repaid | $ (500) | $ (1,650) |  | $ (1,000) |
[1] | (1) See pages 238-240 for an explanation under Accounting information and policies.

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