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Fair Value Measurements - Fair Value of Long-Term Debt (Details) - USD ($) $ in Billions | Jun. 30, 2025 | Sep. 30, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long term debt | $ 8.6 | $ 8.3
Public debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long term debt | 8.3 | 8.1
Other long-term debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of long term debt | $ 0.3 | $ 0.2

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