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Derivative Instruments and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) € in Billions, ¥ in Billions | Jun. 30, 2025 EUR (€) | Jun. 30, 2025 JPY (¥) | Sep. 30, 2024 EUR (€) | Sep. 30, 2024 JPY (¥)
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Foreign currency denominated debt |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount | € 2.9 | ¥ 30 | € 2.9 | ¥ 30

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