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Fair Value Measurements - Fair Value of Long-Term Debt (Details) - USD ($) $ in Billions	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Total fair value of long-term debt	$ 7.5	$ 7.3
Quoted Prices in Active Markets (Level 1)
Debt Instrument [Line Items]
Total fair value of long-term debt	7.1	7.1
Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Total fair value of long-term debt	$ 0.4	$ 0.2

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

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