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Derivative Financial Instruments - Schedule of Amounts Recorded in Consolidated Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts in asset | $ 3 |
Foreign exchange derivative contracts in liability | 6 |
Foreign Exchange Forward |  |
Derivatives, Fair Value [Line Items] |  |
Other assets | 0 | $ 0
Other liabilities | $ (3) | $ 0

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