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Benefit Plans - Pension Plans with Accumulated Benefit Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
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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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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