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Segment Information - Narrative (Details) mi² in Thousands, customer in Millions, $ in Millions |  | 6 Months Ended
--- | --- | ---
Apr. 06, 2020 MW | Jun. 30, 2020 USD ($) mi² customer company MW
JCP&L | NEW JERSEY | Yard's Creek Energy |  |
Segment Reporting Information [Line Items] |  |
Megawatts of net demonstrated capacity of competitive segment | MW | 210 |
JCP&L | NEW JERSEY | NJBPU | Yard's Creek Energy |  |
Segment Reporting Information [Line Items] |  |
Ownership interest acquired | 50.00% |
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 | MW |  | 3,790
Regulated Distribution | Yard's Creek Energy |  |
Segment Reporting Information [Line Items] |  |
Megawatts of net demonstrated capacity of competitive segment | MW |  | 210
Ownership interest acquired |  | 50.00%
Regulated Distribution | JCP&L | NEW JERSEY | Yard's Creek Energy |  |
Segment Reporting Information [Line Items] |  |
Book value | $ |  | $ 44
Other/Corporate | OVEC |  |
Segment Reporting Information [Line Items] |  |
Megawatts of net demonstrated capacity of competitive segment | MW |  | 67
FirstEnergy | Other/Corporate |  |
Segment Reporting Information [Line Items] |  |
Long-term debt and other long-term obligations | $ |  | $ 7,850
Held-for-sale | TMI-2 | Regulated Distribution |  |
Segment Reporting Information [Line Items] |  |
Investments - held for sale | $ |  | 882
Held-for-sale | Yard Creek Generating Facility | Regulated Distribution |  |
Segment Reporting Information [Line Items] |  |
Investments - held for sale | $ |  | $ 44

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