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Plant Closures (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Property, Plant and Equipment [Abstract] |  |  |  |
Accelerated depreciation |  | $ 177 | $ 140 | $ 136
Completed Plant |  |  |  |
Accelerated depreciation |  | 177 | 140 | 136
Property, Plant, and Equipment, Owned, Accumulated Depreciation | $ 659 | 659 |  |
Depreciation |  | 1,900 | 1,800 | $ 1,400
Accumulated depreciation | 35,871 | 35,871 | $ 34,239 |
Cumberland |  |  |  |
Property, Plant and Equipment [Abstract] |  |  |  |
Accelerated depreciation | 16 | 48 |  |
Completed Plant |  |  |  |
Accelerated depreciation | $ 16 | $ 48 |  |
Property, Plant and Equipment [Member] |  |  |  |
Completed Plant |  |  |  |
Property, Plant and Equipment, Dispositions |  | 14 million | 22 million | 4 million

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