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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 27, 2021 USD ($) | Dec. 30, 2020 USD ($) | Jan. 16, 2020 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2021 USD ($) proposal | 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 | Pennsylvania Companies | PPUC | EE&C Phase III |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Approved amount of annual increase |  |  |  | $ 390.0 |  |
Pennsylvania | Pennsylvania Companies | PPUC | New LTIIPs |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  | $ 572.0 |  |  |
Recovery period |  |  | 5 years |  |  |
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 | ENEC |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |
Approved amount of annual increase |  | $ (7.7) |  |  |  |
Amount of requested rate increase (decrease) | $ 19.6 | $ (2.6) |  |  |  |
Amount of requested rate increase (decrease) (percent) | 1.50% |  |  |  |  |
Supplemental requested decrease | $ (7.7) |  |  |  |  |

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