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Net Completed Plant Net Completed Plant (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Completed Plant    
Completed plant cost $ 47,073 $ 45,917
Accumulated depreciation 23,157 22,169
Net completed plant 23,916 23,748
Coal-Fired
    
Completed Plant    
Completed plant cost 13,847 13,726
Accumulated depreciation 8,429 7,962
Net completed plant 5,418 5,764
Gas and Oil-Fired
    
Completed Plant    
Completed plant cost 3,386 3,334
Accumulated depreciation 1,008 916
Net completed plant 2,378 2,418
Nuclear
    
Completed Plant    
Completed plant cost 18,725 18,042
Accumulated depreciation 9,103 8,791
Net completed plant 9,622 9,251
Transmission
    
Completed Plant    
Completed plant cost 6,300 6,075
Accumulated depreciation 2,562 2,427
Net completed plant 3,738 3,648
Hydroelectric
    
Completed Plant    
Completed plant cost 2,392 2,278
Accumulated depreciation 892 869
Net completed plant 1,500 1,409
Other Electrical Plant
    
Completed Plant    
Completed plant cost 1,452 1,490
Accumulated depreciation 792 842
Net completed plant 660 648
Electric Subtotal
    
Completed Plant    
Completed plant cost 46,102 44,945
Accumulated depreciation 22,786 21,807
Net completed plant 23,316 23,138
Multipurpose Dams
    
Completed Plant    
Completed plant cost 928 928
Accumulated depreciation 356 347
Net completed plant 572 581
Other Stewardship
    
Completed Plant    
Completed plant cost 43 44
Accumulated depreciation 15 15
Net completed plant 28 29
Other Subtotal
    
Completed Plant    
Completed plant cost 971 972
Accumulated depreciation 371 362
Net completed plant $ 600 $ 610