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Derivative Financial Instruments - Additional Information (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Derivatives, Fair Value [Line Items] |  |  |
Outstanding hedge contracts |  |  | $ 0
Foreign Exchange Contract | Other Income (Expense) |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Realized foreign exchange forward contract gain | $ 7,000,000 | $ (1,000,000) |
Unrealized foreign exchange forward contract gain (loss) | (5,000,000) | $ 1,000,000 |
Sale |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding hedge contracts | 197,000,000 |  |
Purchase |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Outstanding hedge contracts | $ 124,000,000 |  |

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