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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity method investment, impairment charges | $ 1 | $ 0
Unrealized gain |  | 4
Level 2 measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | $ 4,270 | $ 3,836

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