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Financial instruments and risk management - Currency risk - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |
Borrowings | $ 21,017 | $ 19,582 | $ 17,107
US dollar | Transaction exposure hedging risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Maximum hedging period (in months) | 24 months |  |
Target hedge ratio | 75.00% |  |
Other Currencies | Transaction exposure hedging risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Maximum hedging period (in months) | 18 months |  |
Net investment hedges(1) |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Maximum total net investment value at risk to total net asset percentage | 20.00% |  |
Value at risk, loss defining period (in years) | 1 year |  |
Percentage of probability confidence level | 95.00% |  |
Borrowings | $ 8,109 | 12,584 |
Net Derivative Financial Liabilities (Assets) | $ 3,198 | $ 806 |

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