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Financial instruments and risk management - Schedule of fluctuations in interest and exchange rates to vary from hypothetical amounts (Details) £ in Millions, $ in Millions | 12 Months Ended
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Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2023 GBP (£) | Jun. 30, 2022 USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Impact on income statement gain/(loss) | $ 4,166 | $ 4,479 | [1],[2] |  | $ 4,410 | [2],[3]
Total comprehensive gain/(loss) | $ 3,681 | 3,997 | [1] |  | $ 4,678 | [1]
Interest rate risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable | 0.50% |  |  |  |  |
Interest rate risk | 0.5% decrease in interest rates |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable | (0.50%) |  |  |  |  |
Impact on income statement gain/(loss) | $ 22 | 19 |  |  |  |
Total comprehensive gain/(loss) | $ 43 | 43 |  |  |  |
Interest rate risk | 0.5% increase in interest rates |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable | 0.50% |  |  |  |  |
Impact on income statement gain/(loss) | $ (22) | (19) |  |  |  |
Total comprehensive gain/(loss) | $ (42) | $ (41) |  |  |  |
Currency exchange risk |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable | 10.00% | 10.00% |  | 10.00% |  |
Currency exchange risk | 10% weakening of US dollar |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable | (10.00%) |  |  |  |  |
Impact on income statement gain/(loss) | $ (39) |  |  |  |  |
Total comprehensive gain/(loss) | $ (974) |  |  |  |  |
Currency exchange risk | 10% strengthening of US dollar |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Sensitivity analysis for types of market risk, percentage of reasonably possible change in risk variable | 10.00% |  |  |  |  |
Impact on income statement gain/(loss) | $ 33 |  |  |  |  |
Total comprehensive gain/(loss) | $ 813 |  |  |  |  |
Currency exchange risk | Ten percentage weakening of sterling [Member] |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Impact on income statement gain/(loss) | £ |  |  |  | £ (45) |  |
Total comprehensive gain/(loss) | £ |  |  |  | (1,336) |  |
Currency exchange risk | Ten percentage strengthening of sterling [Member] |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Impact on income statement gain/(loss) | £ |  |  |  | 36 |  |
Total comprehensive gain/(loss) | £ |  |  |  | £ 1,093 |  |
[1] | (1) See pages 238-240 for an explanation under Accounting information and policies.
[2] | (1) See pages 238-240 for an explanation under Accounting information and policies.
[3] | (1) See pages 238-240 for an explanation under Accounting information and policies.

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