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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 17, 2022 USD ($) | May 01, 2022 USD ($) | Mar. 17, 2022 | Dec. 29, 2021 USD ($) | Dec. 27, 2021 USD ($) | Dec. 17, 2021 USD ($) | Nov. 22, 2021 MW | Nov. 18, 2021 USD ($) | Aug. 27, 2021 USD ($) | Dec. 30, 2020 USD ($) | Jan. 16, 2020 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2022 proposal | Dec. 31, 2021 USD ($) | Jun. 18, 2020
FERC | Transmission Related Vegetation Management Programs | Other Nonoperating Income (Expense) | FirstEnergy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax impairment of regulatory asset |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21.0 |
ATSI | FERC | Transmission Related Vegetation Management Programs | Regulated Transmission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax impairment of regulatory asset |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.0 |
ATSI | FERC | Transmission Related Vegetation Management Programs | Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax impairment of regulatory asset |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.0 |
Pennsylvania | DSP June 2019- May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of RFP's | proposal |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
RFP term |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Pennsylvania | Three month period | DSP June 2019- May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |
Pennsylvania | Twelve month period | DSP June 2019- May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |
Pennsylvania | Twenty-four month period | DSP June 2019- May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |
Pennsylvania | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amended amount of rate increase |  |  |  |  |  |  |  | $ 61.0 |  |  |  |  |  |  |
Pennsylvania | PPUC | Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax charges |  |  |  |  |  |  |  |  |  |  |  | $ 61.0 |  |  |
Pennsylvania | Pennsylvania Companies | PPUC | New LTIIPs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  | $ 572.0 |  |  |  |
Pennsylvania | ME | PPUC | EE&C Phase IV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.90%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.10%
Pennsylvania | PN | PPUC | EE&C Phase IV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.30%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00%
Pennsylvania | Penn | PPUC | EE&C Phase IV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.70%
Pennsylvania | WP | PPUC | EE&C Phase IV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.40%
West Virginia | MP and PE | WVPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interim amount of approved rate increase | $ 94.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC | Ft. Martin and Harrison Power Stations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  | $ 142.0 |  |  |  |  |  |  |  |  |
Requested annual rate increase |  |  |  |  |  | $ 3.0 |  |  |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC | Solar Generation Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |
Percent of subscriptions required prior to commencement of construction |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |
Expected cost of the program |  | $ 100.0 |  |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC | ENEC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  |  |  | $ 19.6 | $ (2.6) |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  |  |  | $ (7.7) |  |  |  |  |
Amount of requested rate increase (decrease) (percent) |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |
Supplemental requested decrease |  |  |  |  |  |  |  |  | $ (7.7) |  |  |  |  |  |
Expected cost of the program |  |  |  | $ 2.9 |  |  |  |  |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC | Integrated Resource Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  | $ 19.6 |  |  |  |  |  |  |  |  |  |  |
West Virginia | MP and PE | WVPSC | VMS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  | $ 16.0 |  |  |  |  |  |  |  |  |  |
Surcharge period |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |

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