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REGULATORY MATTERS - Pennsylvania and West Virginia (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
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Aug. 31, 2023 USD ($) | Aug. 30, 2023 USD ($) | Aug. 22, 2023 USD ($) | May 31, 2023 USD ($) | Jan. 13, 2023 USD ($) | Aug. 25, 2022 USD ($) MW | May 01, 2022 USD ($) | Mar. 17, 2022 | Nov. 22, 2021 site MW | Jan. 16, 2020 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 proposal | Dec. 31, 2022 USD ($)
FERC | Regulated Transmission |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax impairment of regulatory asset |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000
Transmission Related Vegetation Management Programs | FERC | FE |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Customer refund |  |  |  |  |  |  |  |  |  |  | $ 45,000 |  |
Customer refund, net |  |  |  |  |  |  |  |  |  |  | 34,000 |  |
Capital assets |  |  |  |  |  |  |  |  |  |  | 195,000 |  |
Operating expense |  |  |  |  |  |  |  |  |  |  | 90,000 |  |
Operating expense, net |  |  |  |  |  |  |  |  |  |  | 67,000 |  |
Reduction in operating expense |  |  |  |  |  |  |  |  |  |  | $ 160,000 |  |
Pennsylvania | PPUC | Pennsylvania Companies |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Public utilities, settlement amount |  | $ 650 |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | DSP June 2019- May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of RFP's | proposal |  |  |  |  |  |  |  |  |  |  |  | 2 |
RFP term |  |  |  |  |  |  |  |  |  |  |  | 2 years |
Pennsylvania | EE&C Phase IV | PPUC | ME |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  | 2.90% |
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  | 3.10% |
Pennsylvania | EE&C Phase IV | PPUC | PN |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  | 3.30% |
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  | 3.00% |
Pennsylvania | EE&C Phase IV | PPUC | Penn |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  | 2.00% |
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  | 2.70% |
Pennsylvania | EE&C Phase IV | PPUC | WP |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  | 2.50% |
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  | 2.40% |
Pennsylvania | New LTIIPs | PPUC | Pennsylvania Companies |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Amount of requested rate increase |  |  |  |  |  |  |  |  |  | $ 572,000 |  |  |
West Virginia | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase | $ 17,000 |  |  | $ 207,000 |  |  |  |  |  |  |  |  |
Requested amount of annual depreciation expense |  |  |  | $ 76,000 | $ 76,000 |  |  |  |  |  |  |  |
Increase in annual amount of depreciation expense |  |  | $ 33,000 |  |  |  |  |  |  |  |  |  |
Recovery period for expenditures for cost recovery program | 2 years |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE | 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% |  |  |  |  |
Number of proposed solar sites | site |  |  |  |  |  |  |  |  | 3 |  |  |  |
Number of solar sites | site |  |  |  |  |  |  |  |  | 5 |  |  |  |
Expected cost of the program |  |  |  |  |  |  | $ 110,000 |  |  |  |  |  |
Number of approved solar sites | site |  |  |  |  |  |  |  |  | 3 |  |  |  |
West Virginia | ENEC | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase | $ 167,500 |  |  |  |  | $ 183,800 |  |  |  |  |  |  |
Under recovered amount, percent | 9.90% |  |  |  |  | 12.20% |  |  |  |  |  |  |
Supplemental requested decrease | $ 267,000 |  |  |  |  | $ 145,000 |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  | $ 92,000 |  |  |  |  |  |  |
Approved ROE | 4.00% |  |  |  |  | 4.00% |  |  |  |  |  |  |
Public utilities, requested under recovery, not recovered, amount | $ 75,600 |  |  |  |  |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  | 1,200 |  |  |  |  |  |  |
Public utilities, deferred requested rate Increase amount | $ 92,000 |  |  |  |  |  |  |  |  |  |  |  |
Three month period | Pennsylvania | DSP June 2019- May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  |  |  |  |  |  | 3 months |
Twelve month period | Pennsylvania | DSP June 2019- May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  |  |  |  |  |  | 12 months |
Twenty-four month period | Pennsylvania | DSP June 2019- May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of energy contract |  |  |  |  |  |  |  |  |  |  |  | 24 months |

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