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Segment Information - Narrative (Details) mi² in Thousands, customer in Millions, $ in Millions			3 Months Ended		9 Months Ended
	Mar. 05, 2021 USD ($)	Apr. 06, 2020	Sep. 30, 2022 USD ($) mi² company MW	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) mi² customer company MW	Sep. 30, 2021 USD ($)
Segment Reporting Information [Line Items]
Gain on sale of Yards Creek (Note 9)			$ 0	$ 0	$ 0	$ 109
JCP&L | Yard's Creek Energy | NEW JERSEY | NJBPU
Segment Reporting Information [Line Items]
Ownership interest sold		50.00%
Regulated Distribution
Segment Reporting Information [Line Items]
Number of existing utility operating companies | company			10		10
Number of customers served by utility operating companies | customer					6
Number of square miles in service area | mi²			65		65
Megawatts of net demonstrated capacity of competitive segment | MW			3,580		3,580
Regulated Distribution | JCP&L | Yard's Creek Energy | NEW JERSEY
Segment Reporting Information [Line Items]
Gain on sale of Yards Creek (Note 9)	$ 109
Other/Corporate | OVEC
Segment Reporting Information [Line Items]
Megawatts of net demonstrated capacity of competitive segment | MW			67		67
FirstEnergy | Other/Corporate
Segment Reporting Information [Line Items]
Long-term debt and other long-term obligations			$ 5,400		$ 5,400

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