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Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Retirement Benefits [Abstract] |  |  |
Employee benefit plan obligation | $ 56 | $ 58 |
Aggregate pension liability recorded in balance sheet | 38 | 38 |
Pension expense | 3 | 3 | $ 3
Employers contribution plan expense | $ 16 | $ 16 | $ 14

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