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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Completed Plant |  |
Completed plant cost | $ 61,114 | $ 58,947
Accumulated depreciation | 29,335 | 28,404
Net completed plant | 31,779 | 30,543
Coal-fired |  |
Completed Plant |  |
Completed plant cost | 16,482 | 15,937
Accumulated depreciation | 11,033 | 10,791
Net completed plant | 5,449 | 5,146
Gas and oil-fired |  |
Completed Plant |  |
Completed plant cost | 5,990 | 4,995
Accumulated depreciation | 1,459 | 1,359
Net completed plant | 4,531 | 3,636
Nuclear |  |
Completed Plant |  |
Completed plant cost | 25,227 | 25,010
Accumulated depreciation | 11,310 | 10,834
Net completed plant | 13,917 | 14,176
Transmission |  |
Completed Plant |  |
Completed plant cost | 7,515 | 7,264
Accumulated depreciation | 3,038 | 3,039
Net completed plant | 4,477 | 4,225
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 3,087 | 3,015
Accumulated depreciation | 1,012 | 967
Net completed plant | 2,075 | 2,048
Other electrical plant |  |
Completed Plant |  |
Completed plant cost | 1,881 | 1,756
Accumulated depreciation | 1,107 | 1,008
Net completed plant | 774 | 748
Computer Software, Intangible Asset [Member] |  |
Completed Plant |  |
Completed plant cost | 3 | 0
Accumulated depreciation | 0 |
Net completed plant | 3 |
Multipurpose dams |  |
Completed Plant |  |
Completed plant cost | 900 | 928
Accumulated depreciation | 367 | 387
Net completed plant | 533 | 541
Other stewardship |  |
Completed Plant |  |
Completed plant cost | 29 | 42
Accumulated depreciation | 9 | 19
Net completed plant | $ 20 | $ 23

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