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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Completed Plant |  |
Completed plant cost | $ 66,442 | $ 66,411
Accumulated depreciation | 34,239 | 34,663
Net completed plant | 32,203 | 31,748
Coal-fired |  |
Completed Plant |  |
Completed plant cost | 18,145 | 19,319
Accumulated depreciation | 13,649 | 14,357
Net completed plant | 4,496 | 4,962
Gas and oil-fired |  |
Completed Plant |  |
Completed plant cost | 6,112 | 6,076
Accumulated depreciation | 1,957 | 1,824
Net completed plant | 4,155 | 4,252
Nuclear |  |
Completed Plant |  |
Completed plant cost | 26,629 | 26,024
Accumulated depreciation | 12,928 | 12,632
Net completed plant | 13,701 | 13,392
Transmission |  |
Completed Plant |  |
Completed plant cost | 8,919 | 8,597
Accumulated depreciation | 3,301 | 3,215
Net completed plant | 5,618 | 5,382
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 3,987 | 3,525
Accumulated depreciation | 1,192 | 1,135
Net completed plant | 2,795 | 2,390
Other electrical plant |  |
Completed Plant |  |
Completed plant cost | 1,724 | 1,943
Accumulated depreciation | 807 | 1,103
Net completed plant | 917 | 840
Multipurpose dams |  |
Completed Plant |  |
Completed plant cost | 900 | 900
Accumulated depreciation | 396 | 388
Net completed plant | 504 | 512
Other stewardship |  |
Completed Plant |  |
Completed plant cost | 26 | 27
Accumulated depreciation | 9 | 9
Net completed plant | $ 17 | $ 18

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