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Commitments, Guarantees and Contingencies - Narrative (Details) $ in Thousands	Feb. 09, 2022 USD ($)	Jul. 21, 2021 USD ($)	Feb. 20, 2018 USD ($)	Mar. 31, 2022 USD ($)	Mar. 11, 2022 director	Dec. 31, 2021 USD ($)
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				$ 1,100,000
Company posted collateral related to net liability positions				$ 52,000
Goal to reduce in GHG emissions				30.00%
United States v. Householder, et al.
Guarantor Obligations [Line Items]
Number of board members not seeking re-election | director					6
Number of board members on special committee | director					3
Smith v FirstEnergy Corp et al., Buldas v FirstEnergy Corp. et al., and Hudock and Cameo Countertops, Inc. v. FirstEnergy Corp. et al.
Guarantor Obligations [Line Items]
Loss contingency accrual						$ 37,500
Emmons v. FirstEnergy Corp. et al.
Guarantor Obligations [Line Items]
Loss contingency accrual						$ 37,500
Shareholder Derivative Lawsuit
Guarantor Obligations [Line Items]
Amount awarded from other party	$ 180,000
Regulation of Waste Disposal
Guarantor Obligations [Line Items]
Accrual for environmental loss contingencies				$ 110,000
Environmental liabilities former gas facilities				70,000
FE
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				602,000
Other Assurances
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				$ 468,000
EPA | Clean Water Act
Guarantor Obligations [Line Items]
Amount awarded to other party			$ 610
U.S. Attorney's Office | United States v. Householder, et al.
Guarantor Obligations [Line Items]
Term of payments		60 days
Term of DPA		3 years
Loss in period		$ 230,000
United States Treasury | United States v. Householder, et al.
Guarantor Obligations [Line Items]
Amount awarded to other party		115,000
Ohio Development Service | United States v. Householder, et al.
Guarantor Obligations [Line Items]
Amount awarded to other party		$ 115,000

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