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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Completed Plant |  |
Completed plant cost | $ 68,199 | $ 66,442
Accumulated depreciation | 35,871 | 34,239
Net completed plant | 32,328 | 32,203
Coal-fired |  |
Completed Plant |  |
Completed plant cost | 18,525 | 18,145
Accumulated depreciation | 14,464 | 13,649
Net completed plant | 4,061 | 4,496
Gas and oil-fired |  |
Completed Plant |  |
Completed plant cost | 6,663 | 6,112
Accumulated depreciation | 2,057 | 1,957
Net completed plant | 4,606 | 4,155
Nuclear |  |
Completed Plant |  |
Completed plant cost | 26,803 | 26,629
Accumulated depreciation | 13,557 | 12,928
Net completed plant | 13,246 | 13,701
Transmission |  |
Completed Plant |  |
Completed plant cost | 9,375 | 8,919
Accumulated depreciation | 3,359 | 3,301
Net completed plant | 6,016 | 5,618
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 4,109 | 3,987
Accumulated depreciation | 1,241 | 1,192
Net completed plant | 2,868 | 2,795
Other electrical plant |  |
Completed Plant |  |
Completed plant cost | 1,798 | 1,724
Accumulated depreciation | 780 | 807
Net completed plant | 1,018 | 917
Multipurpose dams |  |
Completed Plant |  |
Completed plant cost | 900 | 900
Accumulated depreciation | 404 | 396
Net completed plant | 496 | 504
Other stewardship |  |
Completed Plant |  |
Completed plant cost | 26 | 26
Accumulated depreciation | 9 | 9
Net completed plant | $ 17 | $ 17

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