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Organization and Basis of Presentation (Details 3) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment    
In Service $ 43,767 $ 49,952
Accumulated Depreciation (15,731) (15,160)
Property, plant and equipment in service net of accumulated provision for depreciation 28,036 34,792
Construction Work in Progress 1,351 2,422
Total net property, plant and equipment 29,387 37,214
Capital leased assets 244 253
Regulated Distribution    
Property, Plant and Equipment    
In Service 24,979 24,034
Accumulated Depreciation (7,169) (6,865)
Property, plant and equipment in service net of accumulated provision for depreciation 17,810 17,169
Construction Work in Progress 472 530
Total net property, plant and equipment 18,282 17,699
Regulated Transmission    
Property, Plant and Equipment    
In Service 9,342 8,222
Accumulated Depreciation (1,948) (1,840)
Property, plant and equipment in service net of accumulated provision for depreciation 7,394 6,382
Construction Work in Progress 383 484
Total net property, plant and equipment 7,777 6,866
Net plant in service reclassified 326  
Competitive Energy Services    
Property, Plant and Equipment    
In Service 8,680 17,214
Accumulated Depreciation (6,267) (6,213)
Property, plant and equipment in service net of accumulated provision for depreciation 2,413 11,001
Construction Work in Progress 453 1,304
Total net property, plant and equipment 2,866 12,305
Corporate/Other    
Property, Plant and Equipment    
In Service 766 482
Accumulated Depreciation (347) (242)
Property, plant and equipment in service net of accumulated provision for depreciation 419 240
Construction Work in Progress 43 104
Total net property, plant and equipment 462 344
FES    
Property, Plant and Equipment    
In Service 7,057 14,311
Accumulated Depreciation (5,929) (5,765)
Property, plant and equipment in service net of accumulated provision for depreciation 1,128 8,546
Construction Work in Progress 427 1,157
Total net property, plant and equipment 1,555 9,703
FES | Fossil Generation    
Property, Plant and Equipment    
In Service 2,212 5,911
Accumulated Depreciation (1,720) (1,937)
Property, plant and equipment in service net of accumulated provision for depreciation 492 3,974
Construction Work in Progress 63 218
Total net property, plant and equipment 555 4,192
FES | Nuclear Generation    
Property, Plant and Equipment    
In Service 2,065 5,617
Accumulated Depreciation (1,723) (1,574)
Property, plant and equipment in service net of accumulated provision for depreciation 342 4,043
Construction Work in Progress 118 512
Total net property, plant and equipment 460 4,555
FES | Nuclear Fuel    
Property, Plant and Equipment    
In Service 2,637 2,616
Accumulated Depreciation (2,418) (2,198)
Property, plant and equipment in service net of accumulated provision for depreciation 219 418
Construction Work in Progress 241 283
Total net property, plant and equipment 460 701
FES | Other    
Property, Plant and Equipment    
In Service 143 167
Accumulated Depreciation (68) (56)
Property, plant and equipment in service net of accumulated provision for depreciation 75 111
Construction Work in Progress 5 144
Total net property, plant and equipment $ 80 $ 255