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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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