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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

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