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Net Completed Plant Net Completed Plant (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Sep. 30, 2014
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Completed Plant |  |
Completed plant cost | $ 50,069 | $ 47,564
Accumulated depreciation | 26,318 | 24,589
Net completed plant | 23,751 | 22,975
Coal-fired |  |
Completed Plant |  |
Completed plant cost | 15,202 | 14,078
Accumulated depreciation | 9,942 | 9,065
Net completed plant | 5,260 | 5,013
Gas and oil-fired |  |
Completed Plant |  |
Completed plant cost | 3,794 | 3,411
Accumulated depreciation | 1,194 | 1,094
Net completed plant | 2,600 | 2,317
Nuclear |  |
Completed Plant |  |
Completed plant cost | 18,920 | 18,489
Accumulated depreciation | 10,063 | 9,593
Net completed plant | 8,857 | 8,896
Transmission |  |
Completed Plant |  |
Completed plant cost | 6,803 | 6,519
Accumulated depreciation | 2,823 | 2,683
Net completed plant | 3,980 | 3,836
Hydroelectric |  |
Completed Plant |  |
Completed plant cost | 2,702 | 2,547
Accumulated depreciation | 911 | 889
Net completed plant | 1,791 | 1,658
Other electrical plant |  |
Completed Plant |  |
Completed plant cost | 1,678 | 1,550
Accumulated depreciation | 997 | 885
Net completed plant | 681 | 665
Electric Subtotal |  |
Completed Plant |  |
Completed plant cost | 49,099 | 46,594
Accumulated depreciation | 25,930 | 24,209
Net completed plant | 23,169 | 22,385
Multipurpose dams |  |
Completed Plant |  |
Completed plant cost | 928 | 928
Accumulated depreciation | 371 | 364
Net completed plant | 557 | 564
Other stewardship |  |
Completed Plant |  |
Completed plant cost | 42 | 42
Accumulated depreciation | 17 | 16
Net completed plant | 25 | 26
Other Subtotal |  |
Completed Plant |  |
Completed plant cost | 970 | 970
Accumulated depreciation | 388 | 380
Net completed plant | $ 582 | $ 590

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