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Segment Information (Details Textuals)
mi² in Thousands, customer in Millions, $ in Billions
12 Months Ended
Dec. 31, 2016
USD ($)
mi²
customer
company
MW
Oct. 09, 2013
MW
Segment Reporting Information [Line Items]    
Ownership interest (percent) 3.00%  
Other/Corporate    
Segment Reporting Information [Line Items]    
Long-term debt and other long-term obligations | $ $ 4.2  
Debt subject to variable interest rate (percent) 28.00%  
Regulated Distribution    
Segment Reporting Information [Line Items]    
Number of existing utility operating companies | company 10  
Number of customers served by utility operating companies | customer 6  
Number of square miles in service area | mi² 65  
Megawatts of net demonstrated capacity of competitive segment (in MW's)   3,790
CES    
Segment Reporting Information [Line Items]    
Megawatts of net demonstrated capacity of competitive segment (in MW's) 13,162  
FE | Revolving Credit Facility | Other/Corporate    
Segment Reporting Information [Line Items]    
Long-term line of credit | $ $ 2.7  
Global Holding | Signal Peak | FEV    
Segment Reporting Information [Line Items]    
Ownership interest (percent) 33.33%  
Pleasants Power Station | CES    
Segment Reporting Information [Line Items]    
Megawatts of net demonstrated capacity of competitive segment (in MW's) 1,300  
Purchase Agreement with Aspen Generating, LLC    
Segment Reporting Information [Line Items]    
Megawatts of net demonstrated capacity of competitive segment (in MW's) 1,572