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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Completed Plant |  |
Completed plant cost | $ 62,944 | $ 61,114
Accumulated depreciation | 31,384 | 29,335
Net completed plant | 31,560 | 31,779
Coal-fired |  |
Completed Plant |  |
Completed plant cost | 17,400 | 16,482
Accumulated depreciation | 12,538 | 11,033
Net completed plant | 4,862 | 5,449
Gas and oil-fired |  |
Completed Plant |  |
Completed plant cost | 6,054 | 5,990
Accumulated depreciation | 1,562 | 1,459
Net completed plant | 4,492 | 4,531
Nuclear |  |
Completed Plant |  |
Completed plant cost | 25,543 | 25,227
Accumulated depreciation | 11,656 | 11,310
Net completed plant | 13,887 | 13,917
Transmission |  |
Completed Plant |  |
Completed plant cost | 7,932 | 7,515
Accumulated depreciation | 3,083 | 3,038
Net completed plant | 4,849 | 4,477
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 3,163 | 3,087
Accumulated depreciation | 1,051 | 1,012
Net completed plant | 2,112 | 2,075
Other electrical plant |  |
Completed Plant |  |
Completed plant cost | 1,920 | 1,881
Accumulated depreciation | 1,110 | 1,107
Net completed plant | 810 | 774
Computer Software, Intangible Asset [Member] |  |
Completed Plant |  |
Completed plant cost | 3 | 3
Accumulated depreciation | 1 | 0
Net completed plant | 2 | 3
Multipurpose dams |  |
Completed Plant |  |
Completed plant cost | 900 | 900
Accumulated depreciation | 373 | 367
Net completed plant | 527 | 533
Other stewardship |  |
Completed Plant |  |
Completed plant cost | 29 | 29
Accumulated depreciation | 10 | 9
Net completed plant | $ 19 | $ 20

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