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Environmental Liabilities Former Gas Facilities.

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Reduction in Power Plants Green House Gas Pollution, Goal, Percentage

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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Amount awarded from other party in judgment or settlement of litigation.

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Amount awarded to other party in judgment or settlement of litigation.

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The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details) $ in Thousands	Feb. 09, 2022 USD ($)	Jul. 21, 2021 USD ($)	Oct. 29, 2020 USD ($) review	Mar. 31, 2023 USD ($)	Mar. 11, 2022 director
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				$ 1,000,000
Company posted collateral related to net liability positions				54,000
Collateral received				$ 66,000
Goal to reduce in GHG emissions				30.00%
Litigation Settlement, Amount Awarded to Other Party, Civil Penalty			$ 3,860
Litigation Settlement, Number of Voluntary Compliance Reports \| review			2
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
Shareholder Derivative Lawsuit
Guarantor Obligations [Line Items]
Amount awarded to other party	$ 36,000
Amount awarded from other party	$ 180,000
Regulation of Waste Disposal
Guarantor Obligations [Line Items]
Accrual for environmental loss contingencies				$ 97,000
Environmental liabilities former gas facilities				62,000
U.S. Attorney's Office \| United States v. Householder, et al.
Guarantor Obligations [Line Items]
Term of DPA		3 years
Loss in period		$ 230,000
Term of payments		60 days
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
FE
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				524,000
Other Assurances
Guarantor Obligations [Line Items]
Outstanding guarantees and other assurances aggregated				$ 451,000