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Segment Information - Narrative (Details) mi² in Thousands, customer in Millions, $ in Millions				3 Months Ended
	Apr. 14, 2022 USD ($)	Mar. 05, 2021 USD ($)	Apr. 06, 2020	Mar. 31, 2022 USD ($) mi² customer company MW	Mar. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Gain on sale of Yards Creek (Note 9)				$ 0	$ 109
FET | North American Transmission Company II LLC | Forecast
Segment Reporting Information [Line Items]
Sale of ownership interest by parent	19.90%
Sale price of ownership interest by parent	$ 2,375
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
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				3,580
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
FirstEnergy | Other/Corporate
Segment Reporting Information [Line Items]
Long-term debt and other long-term obligations				$ 7,400

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Represents a sale by the parent of a portion of its equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The sale of the equity interest represented by this element does not result in a loss of control by the parent.

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