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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Completed Plant |  |
Completed plant cost | $ 51,564 | $ 50,069
Accumulated depreciation | 27,592 | 26,318
Net completed plant | 23,972 | 23,751
Coal-fired |  |
Completed Plant |  |
Completed plant cost | 15,587 | 15,202
Accumulated depreciation | 10,473 | 9,942
Net completed plant | 5,114 | 5,260
Gas and oil-fired |  |
Completed Plant |  |
Completed plant cost | 3,918 | 3,794
Accumulated depreciation | 1,267 | 1,194
Net completed plant | 2,651 | 2,600
Nuclear |  |
Completed Plant |  |
Completed plant cost | 19,280 | 18,920
Accumulated depreciation | 10,422 | 10,063
Net completed plant | 8,858 | 8,857
Transmission |  |
Completed Plant |  |
Completed plant cost | 7,061 | 6,803
Accumulated depreciation | 2,975 | 2,823
Net completed plant | 4,086 | 3,980
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 2,891 | 2,702
Accumulated depreciation | 932 | 911
Net completed plant | 1,959 | 1,791
Other electrical plant |  |
Completed Plant |  |
Completed plant cost | 1,857 | 1,678
Accumulated depreciation | 1,126 | 997
Net completed plant | 731 | 681
Electric Subtotal |  |
Completed Plant |  |
Completed plant cost | 50,594 | 49,099
Accumulated depreciation | 27,195 | 25,930
Net completed plant | 23,399 | 23,169
Multipurpose dams |  |
Completed Plant |  |
Completed plant cost | 928 | 928
Accumulated depreciation | 379 | 371
Net completed plant | 549 | 557
Other stewardship |  |
Completed Plant |  |
Completed plant cost | 42 | 42
Accumulated depreciation | 18 | 17
Net completed plant | 24 | 25
Other Subtotal |  |
Completed Plant |  |
Completed plant cost | 970 | 970
Accumulated depreciation | 397 | 388
Net completed plant | $ 573 | $ 582

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