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Organization and Basis of Presentation (Details 3) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment    
In Service $ 39,778 $ 43,767
Accumulated Depreciation (11,925) (15,731)
Property, plant and equipment in service net of accumulated provision for depreciation 27,853 28,036
Construction Work in Progress 1,026 1,351
Total net property, plant and equipment 28,879 29,387
Capital leased assets 238 244
Regulated Distribution    
Property, Plant and Equipment    
In Service 25,950 24,979
Accumulated Depreciation (7,503) (7,169)
Property, plant and equipment in service net of accumulated provision for depreciation 18,447 17,810
Construction Work in Progress 469 472
Total net property, plant and equipment 18,916 18,282
Regulated Transmission    
Property, Plant and Equipment    
In Service 10,102 9,342
Accumulated Depreciation (2,055) (1,948)
Property, plant and equipment in service net of accumulated provision for depreciation 8,047 7,394
Construction Work in Progress 480 383
Total net property, plant and equipment 8,527 7,777
Competitive Energy Services    
Property, Plant and Equipment    
In Service 2,902 8,680
Accumulated Depreciation (1,958) (6,267)
Property, plant and equipment in service net of accumulated provision for depreciation 944 2,413
Construction Work in Progress 28 453
Total net property, plant and equipment 972 2,866
Corporate/Other    
Property, Plant and Equipment    
In Service 824 766
Accumulated Depreciation (409) (347)
Property, plant and equipment in service net of accumulated provision for depreciation 415 419
Construction Work in Progress 49 43
Total net property, plant and equipment 464 462
FES    
Property, Plant and Equipment    
In Service 2,495 7,057
Accumulated Depreciation (1,823) (5,929)
Property, plant and equipment in service net of accumulated provision for depreciation 672 1,128
Construction Work in Progress 22 427
Total net property, plant and equipment 694 1,555
FES | Fossil Generation    
Property, Plant and Equipment    
In Service 2,344 2,212
Accumulated Depreciation (1,743) (1,720)
Property, plant and equipment in service net of accumulated provision for depreciation 601 492
Construction Work in Progress 19 63
Total net property, plant and equipment 620 555
FES | Nuclear Generation    
Property, Plant and Equipment    
In Service   2,065
Accumulated Depreciation   (1,723)
Property, plant and equipment in service net of accumulated provision for depreciation   342
Construction Work in Progress   118
Total net property, plant and equipment   460
FES | Nuclear Fuel    
Property, Plant and Equipment    
In Service   2,637
Accumulated Depreciation   (2,418)
Property, plant and equipment in service net of accumulated provision for depreciation   219
Construction Work in Progress   241
Total net property, plant and equipment   460
FES | Other    
Property, Plant and Equipment    
In Service 151 143
Accumulated Depreciation (80) (68)
Property, plant and equipment in service net of accumulated provision for depreciation 71 75
Construction Work in Progress 3 5
Total net property, plant and equipment $ 74 $ 80