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Benefit Plans - Pension Plans with Accumulated Benefit Obligations (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Retirement Benefits [Abstract] |  |
Accumulated benefit obligation exceeds the fair value of plan assets, projected benefit obligation | $ 2,335 | $ 2,382
Projected benefit obligation exceeds the fair value of plan assets, projected benefit obligation | 2,354 | 2,382
Accumulated benefit obligation exceeds the fair value of plan assets, accumulated benefit obligation | 2,272 | 2,318
Accumulated benefit obligation exceeds the fair value of plan assets, fair value of plan assets | 1,836 | 1,927
Projected benefit obligation exceeds the fair value of plan assets, fair value of plan assets | $ 1,854 | $ 1,927

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