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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity method investment, impairment charges $ 1 $ 1
Unrealized gain 4 2
Level 2 measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt instrument, fair value disclosure $ 3,836 $ 3,525