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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Completed Plant |  |
Completed plant cost | $ 64,970 | $ 62,944
Accumulated depreciation | 33,550 | 31,384
Net completed plant | 31,420 | 31,560
Revisions to asset retirement costs | 1,100 |
Coal-fired |  |
Completed Plant |  |
Completed plant cost | 18,613 | 17,400
Accumulated depreciation | 13,944 | 12,538
Net completed plant | 4,669 | 4,862
Gas and oil-fired |  |
Completed Plant |  |
Completed plant cost | 6,010 | 6,054
Accumulated depreciation | 1,696 | 1,562
Net completed plant | 4,314 | 4,492
Nuclear |  |
Completed Plant |  |
Completed plant cost | 25,741 | 25,543
Accumulated depreciation | 12,141 | 11,656
Net completed plant | 13,600 | 13,887
Transmission |  |
Completed Plant |  |
Completed plant cost | 8,283 | 7,932
Accumulated depreciation | 3,140 | 3,083
Net completed plant | 5,143 | 4,849
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 3,410 | 3,163
Accumulated depreciation | 1,090 | 1,051
Net completed plant | 2,320 | 2,112
Other electrical plant |  |
Completed Plant |  |
Completed plant cost | 1,981 | 1,920
Accumulated depreciation | 1,146 | 1,110
Net completed plant | 835 | 810
Computer Software, Intangible Asset [Member] |  |
Completed Plant |  |
Completed plant cost | 3 | 3
Accumulated depreciation | 2 | 1
Net completed plant | 1 | 2
Multipurpose dams |  |
Completed Plant |  |
Completed plant cost | 900 | 900
Accumulated depreciation | 381 | 373
Net completed plant | 519 | 527
Other stewardship |  |
Completed Plant |  |
Completed plant cost | 29 | 29
Accumulated depreciation | 10 | 10
Net completed plant | $ 19 | $ 19

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