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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 ($)
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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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