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Organization and Basis of Presentation (Details Textuals)
mi in Thousands, customer in Millions, MWh in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Feb. 17, 2017
USD ($)
Mar. 31, 2017
USD ($)
MWh
transmission_center
MW
Jan. 31, 2017
USD ($)
limited_guaranty
Natural_gas_plant
MW
Mar. 06, 2017
MWh
MW
Mar. 31, 2017
USD ($)
customer
transmission_center
company
mi
MW
Mar. 31, 2016
USD ($)
Dec. 31, 2018
MWh
Dec. 31, 2017
MWh
Dec. 31, 2016
USD ($)
MWh
Dec. 31, 2020
MW
Jun. 30, 2017
USD ($)
Mar. 07, 2017
USD ($)
MW
Dec. 31, 2015
MW
Property, Plant and Equipment [Line Items]                          
Aggregate amount of capacity | MW         17,000                
Length of transmission lines | mi         24                
Number of regional transmission centers | transmission_center   2     2                
Capitalized cost of equity         $ 8,000,000                
Capitalized interest         12,000,000 $ 17,000,000              
Net cash used in operating activities         (785,000,000) (650,000,000)              
Net cash provided by financing activities         $ (58,000,000) 230,000,000              
Accounting Standards Update 2016-09                          
Property, Plant and Equipment [Line Items]                          
Net cash used in operating activities                 $ (12,000,000)        
Net cash provided by financing activities                 12,000,000        
Accounting Standards Update 2016-09 | Retained Earnings                          
Property, Plant and Equipment [Line Items]                          
Cumulative effect of new accounting principle                 $ 6,000,000        
Regulated Distribution                          
Property, Plant and Equipment [Line Items]                          
Number of existing utility operating companies | company         10                
Number of customers served by utility operating companies | customer         6                
Plant capacity (in MW's) | MW   3,790     3,790                
CES                          
Property, Plant and Equipment [Line Items]                          
Capacity in deactivated power plants (in MW's) | MW                         6,770
Plant capacity (in MW's) | MW   13,162   13,000 13,162             10,000  
Purchase power agreements additional capacity (in MWh) | MWh       5                  
Contract sales (in MWh) | MWh                 53        
FES                          
Property, Plant and Equipment [Line Items]                          
Net cash used in operating activities         $ (221,000,000) (229,000,000)              
Net cash provided by financing activities         (19,000,000) $ 46,000,000              
FES | CES                          
Property, Plant and Equipment [Line Items]                          
Inability to extend or refinance debt next year   $ 515,000,000     515,000,000                
Scenario, Forecast | CES                          
Property, Plant and Equipment [Line Items]                          
Capacity in deactivated power plants (in MW's) | MW                   856      
Scenario, Forecast | FES | CES                          
Property, Plant and Equipment [Line Items]                          
Inability to extend or refinance debt for the remainder of fiscal year                     $ 130,000,000    
Inability to extend or refinance interest payments and sale-leaseback commitments for the remainder of fiscal year                     $ 108,000,000    
Minimum | CES                          
Property, Plant and Equipment [Line Items]                          
Annual generation capacity (in MW) | MWh   60   70                  
Minimum | Scenario, Forecast | CES                          
Property, Plant and Equipment [Line Items]                          
Expected contract sales (in MWh) | MWh             35 40          
Maximum | CES                          
Property, Plant and Equipment [Line Items]                          
Annual generation capacity (in MW) | MWh   65   75                  
Maximum | Scenario, Forecast | CES                          
Property, Plant and Equipment [Line Items]                          
Expected contract sales (in MWh) | MWh             40 45          
Line of Credit | Revolving Credit Facility                          
Property, Plant and Equipment [Line Items]                          
Maximum amount borrowed under revolving credit facility   $ 500,000,000     $ 500,000,000                
Purchase Agreement with Aspen Generating, LLC                          
Property, Plant and Equipment [Line Items]                          
Plant capacity (in MW's) | MW   1,572 1,572   1,572                
Cash purchase price $ 925,000,000   $ 925,000,000                    
Assets held for sale   $ 919,000,000     $ 919,000,000                
Disposal Group, Including Discontinued Operation, Inventory   3,000,000     3,000,000                
Disposal Group, Including Discontinued Operation, Asset Retirement Obligations   $ 1,000,000     $ 1,000,000                
Purchase Agreement with Aspen Generating, LLC | AE Supply                          
Property, Plant and Equipment [Line Items]                          
Number of gas generating plants | Natural_gas_plant     4                    
Discharge of note indenture     $ 305,000,000                    
Make-whole premiums     $ 100,000,000                    
Number of limited guaranties | limited_guaranty     2                    
Purchase Agreement with Aspen Generating, LLC | AGC                          
Property, Plant and Equipment [Line Items]                          
Ownership percentage     59.00%                    
Purchase Agreement with Aspen Generating, LLC | Minimum | AE Supply                          
Property, Plant and Equipment [Line Items]                          
Term of guaranties     1 year                    
Purchase Agreement with Aspen Generating, LLC | Maximum | AE Supply                          
Property, Plant and Equipment [Line Items]                          
Term of guaranties     3 years                    
Pleasants Power Station                          
Property, Plant and Equipment [Line Items]                          
Plant capacity (in MW's) | MW                       1,000  
Pleasants Power Station | CES                          
Property, Plant and Equipment [Line Items]                          
Plant capacity (in MW's) | MW   1,300     1,300                
Held-for-sale | Pleasants Power Station                          
Property, Plant and Equipment [Line Items]                          
Assets held for sale                       $ 195,000,000