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REGULATORY MATTERS - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Sep. 13, 2024 USD ($) | Jul. 22, 2024 USD ($) | Apr. 02, 2024 USD ($) | Mar. 26, 2024 USD ($) | Jan. 23, 2024 USD ($) | Nov. 30, 2023 USD ($) | Aug. 31, 2023 USD ($) | Aug. 22, 2023 USD ($) | May 31, 2023 USD ($) | Apr. 24, 2023 MW | Jan. 13, 2023 USD ($) | May 01, 2022 MW | Nov. 22, 2021 site | Jan. 16, 2020 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($)
Pennsylvania | ENEC Phase IV | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved energy consumption reduction targets, cost recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 390.0
Pennsylvania | ENEC Phase IV | PPUC | ME |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.90%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.10%
Pennsylvania | ENEC Phase IV | PPUC | PN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.30%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00%
Pennsylvania | ENEC Phase IV | PPUC | Penn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.70%
Pennsylvania | ENEC Phase IV | PPUC | WP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Demand reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50%
Energy consumption reduction targets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.40%
Pennsylvania | New LTIP's | PPUC | Pennsylvania Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Public utilities, approved project, total capital investments |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 572.0 |  |
Public utilities, requested program phase approval, proposed investment amount |  | $ 1,600.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | Long-Term Infrastructure Improvement Plan From 2025-2029 | PPUC | Pennsylvania Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, requested program phase approval, proposed investment amount |  | $ 1,400.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | PPUC | FE PA | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase base distribution rate |  |  | $ 502.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed ROE |  |  | 11.30% |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed debt |  |  | 46.20% |  |  |  |  |  |  |  |  |  |  |  |  |
Approved capital structure |  |  | 53.80% |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, net average rate increase, percentage |  |  | 0.077 |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, residential rate increase, percentage |  |  | 0.105 |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | Enhanced Vegetation Management Program | PPUC | FE PA | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase | $ 225.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  |  |  |  |  |  | $ 207.0 |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  |  |  | $ 105.0 | $ 105.0 |  |  |  |  |  |  |  |  |  |  |
Requested amount of annual depreciation expense |  |  |  |  |  |  |  |  | $ 75.0 |  | $ 76.0 |  |  |  |  |
Increase in annual amount of depreciation expense |  |  |  |  | $ 33.0 |  |  | $ 33.0 |  |  |  |  |  |  |  |
Public utilities, approved rate increase, amount of income (loss) from continuing operations before equity method investments, income taxes, noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60.0 |
West Virginia | WVPSC | MP and PE | Solar Generation Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of subscriptions required prior to commencement |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  | 30 |  | 50 |  |  |  |
Number of approved solar sites | site |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
West Virginia | ENEC | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  |  |  |  | $ 167.5 |  |  |  |  |  |  |  |  |
Under recovered amount, percent |  |  |  |  |  |  | 9.90% |  |  |  |  |  |  |  |  |
Deferred requested rate increase |  |  |  |  |  |  | $ 92.0 |  |  |  |  |  |  |  |  |
Supplemental requested decrease |  |  |  |  |  |  | 267.0 |  |  |  |  |  |  |  |  |
Amount not recovered |  |  |  |  |  |  | $ 75.6 |  |  |  |  |  |  |  |  |
Public utilities, requested under recovery, not recovered, carrying charge, percent |  |  |  |  |  |  | 0.04 |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  |  |  |  |  | $ 55.4 |  |  |  |  |  |  |  |  |  |
Recovery amounts |  |  |  |  |  | 50.0 |  |  |  |  |  |  |  |  |  |
West Virginia | Expanded Net Energy Cost Through 2026 | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  |  |  |  |  | $ 184.0 |  |  |  |  |  |  |  |  |  |

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