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Organization and Basis of Presentation (Details Textuals)
mi in Thousands, MW in Thousands, customer in Millions, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
transmission_center
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
customer
transmission_center
company
mi
MW
Sep. 30, 2015
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Nov. 04, 2016
USD ($)
Property, Plant and Equipment [Line Items]                
Aggregate amount of capacity | MW     17          
Length of transmission lines | mi     24          
Number of regional transmission centers | transmission_center 2   2          
Capitalized cost of equity $ 11 $ 10 $ 28 $ 40        
Capitalized interest 17 $ 16 $ 51 $ 53        
Utilization of Accelerated Useful Life                
Property, Plant and Equipment [Line Items]                
Reduction to depreciation $ 21           $ 19  
Accounting Standards Update 2015-03 | Deferred Charges and Other Assets                
Property, Plant and Equipment [Line Items]                
Debt issuance costs             (93)  
Accounting Standards Update 2015-03 | Long-Term Debt and Other Long-Term Obligations                
Property, Plant and Equipment [Line Items]                
Debt issuance costs             93  
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          
FES | Accounting Standards Update 2015-03 | Deferred Charges and Other Assets                
Property, Plant and Equipment [Line Items]                
Debt issuance costs             (17)  
FES | Accounting Standards Update 2015-03 | Long-Term Debt and Other Long-Term Obligations                
Property, Plant and Equipment [Line Items]                
Debt issuance costs             $ 17  
FES | CES                
Property, Plant and Equipment [Line Items]                
Additional collateral posted or accelerated payments               $ 355
Scenario, Forecast | FES | CES                
Property, Plant and Equipment [Line Items]                
Inability to extend or refinance debt         $ 515 $ 130    
Minimum                
Property, Plant and Equipment [Line Items]                
Strategic review of competitive operations period     12 months          
Maximum                
Property, Plant and Equipment [Line Items]                
Strategic review of competitive operations period     18 months