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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity method investment,impairment charges | $ 1 |
Unrealized gain | 2 |
Level 2 measurement |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instrument, fair value disclosure | $ 3,525 | $ 3,181

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