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Fair Value Measurements - Fair Value of Long-Term Debt (Details) - USD ($) $ in Billions	Mar. 31, 2024	Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term debt	$ 8.0	$ 7.5
Public debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term debt	7.6	7.1
Other long-term debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term debt	$ 0.4	$ 0.4

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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