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Net Completed Plant Net Completed Plant (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Completed Plant    
Completed plant cost $ 47,564 $ 47,073
Accumulated depreciation 24,589 23,157
Net completed plant 22,975 23,916
Coal-Fired
    
Completed Plant    
Completed plant cost 14,078 13,847
Accumulated depreciation 9,065 8,429
Net completed plant 5,013 5,418
Gas and Oil-Fired
    
Completed Plant    
Completed plant cost 3,411 3,386
Accumulated depreciation 1,094 1,008
Net completed plant 2,317 2,378
Nuclear
    
Completed Plant    
Completed plant cost 18,489 18,725
Accumulated depreciation 9,593 9,103
Net completed plant 8,896 9,622
Transmission
    
Completed Plant    
Completed plant cost 6,519 6,300
Accumulated depreciation 2,683 2,562
Net completed plant 3,836 3,738
Hydroelectric
    
Completed Plant    
Completed plant cost 2,547 2,392
Accumulated depreciation 889 892
Net completed plant 1,658 1,500
Other Electrical Plant
    
Completed Plant    
Completed plant cost 1,550 1,452
Accumulated depreciation 885 792
Net completed plant 665 660
Electric Subtotal
    
Completed Plant    
Completed plant cost 46,594 46,102
Accumulated depreciation 24,209 22,786
Net completed plant 22,385 23,316
Multipurpose Dams
    
Completed Plant    
Completed plant cost 928 928
Accumulated depreciation 364 356
Net completed plant 564 572
Other Stewardship
    
Completed Plant    
Completed plant cost 42 43
Accumulated depreciation 16 15
Net completed plant 26 28
Other Subtotal
    
Completed Plant    
Completed plant cost 970 971
Accumulated depreciation 380 371
Net completed plant $ 590 $ 600