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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 |

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