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Regulatory Matters - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2020 USD ($) MW | Aug. 28, 2020 USD ($) | May 01, 2020 USD ($) | Aug. 30, 2019 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2021 proposal | Jun. 18, 2020
ATSI | FERC | Transmission Related Vegetation Management Programs |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  | $ 19.0 |  |  |  |
Amended amount of rate increase |  |  | $ 85.0 |  |  |  |
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] |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  | $ (55.0) |  |  |  |  |
Amount of requested rate increase (decrease) (percent) |  | (4.00%) |  |  |  |  |
Recovery of deferred, incremental uncollectible and other related costs |  | $ 10.5 |  |  |  |  |
Amount of requested rate decrease | $ 2.6 |  |  |  |  |  |
West Virginia | MP and PE | WVPSC | Modernization and Improvement Program For Coal-Fired Boilers |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  | $ 5.0 |  |  |  |  |
West Virginia | MP and PE | WVPSC | Integrated Resource Plan |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |
Project period | 15 years |  |  |  |  |  |
Capacity of plant to be constructed (in MW's) | MW | 50 |  |  |  |  |  |

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