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Derivative Instruments and Hedging Activities - Schedule of Gross and Net Amounts of Derivative Instruments and Other Amounts (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Sep. 30, 2025
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Gross amount recognized, assets | $ 44 | $ 37
Gross amount eligible for offsetting, assets | (9) | (10)
Net amount, assets | 35 | 27
Gross amount recognized, liabilities | 9 | 14
Gross amount eligible for offsetting, liabilities | (9) | (10)
Net amount, liabilities | $ 0 | $ 4

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