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Benefit Plans - Pension Plans with Accumulated Benefit Obligations (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
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Retirement Benefits [Abstract] |  |
Accumulated benefit obligation exceeds the fair value of plan assets, projected benefit obligation | $ 2,104 | $ 3,406
Projected benefit obligation exceeds the fair value of plan assets, projected benefit obligation | 2,182 | 3,475
Accumulated benefit obligation exceeds the fair value of plan assets, accumulated benefit obligation | 2,059 | 3,309
Accumulated benefit obligation exceeds the fair value of plan assets, fair value of plan assets | 1,644 | 2,712
Projected benefit obligation exceeds the fair value of plan assets, fair value of plan assets | $ 1,720 | $ 2,780

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