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REGULATORY MATTERS - Pennsylvania and West Virginia (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 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 ($) | Dec. 08, 2023 auditMatter | Nov. 30, 2023 USD ($) | Aug. 31, 2023 USD ($) | Aug. 22, 2023 USD ($) | May 31, 2023 USD ($) | Apr. 24, 2023 MW | Jan. 13, 2023 USD ($) | May 01, 2022 MW | Feb. 24, 2022 | Nov. 22, 2021 site | Jan. 16, 2020 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2024 USD ($)
Transmission Related Vegetation Management Programs | FERC | FE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer refund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 |
Customer refund, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,000,000 |
Capital assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 195,000,000 |
Operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |
Operating expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 67,000,000 |
Utilities reclassification to operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 105,000,000 |
Amount of costs recovered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000
Reduction in operating expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,000,000
Utilities cooperate support |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000
Public utilities, number of unresolved audit matters | auditMatter |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities, transmission owning utilities join an RTO |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00500000 |  |  |  |  |
Pennsylvania | EE&C Phase IV | PPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved energy consumption reduction targets, cost recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 390,000,000
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 |  |  |
Approved total capital investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 572,000,000 |  |  |
Proposed investment amount |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | 2025-2029 LTIIP | PPUC | Pennsylvania Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed investment amount |  | $ 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | PPUC | FE PA | Distribution Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase base distribution rate |  |  | $ 502,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved ROE |  |  | 11.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital structure, debt |  |  | 46.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital structure, equity |  |  | 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 Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  |  |  |  |  |  |  | $ 207,000,000 |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  | $ 105,000,000 | $ 105,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested amount of annual depreciation expense |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  | $ 76,000,000 |  |  |  |  |  |  |
Increase in annual amount of depreciation expense |  |  |  |  | $ 33,000,000 |  |  |  | $ 33,000,000 |  |  |  |  |  |  |  |  |  |
Pre tax benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,000,000 |  |
West Virginia | WVPSC | MP and PE | Solar Generation Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of subscriptions required prior to commencement of construction |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  | 30 |  | 50 |  |  |  |  |  |
Expected cost of the program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110,000,000
Number of approved solar sites | site |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
West Virginia | ENEC | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  |  |  |  |  | $ 167,500,000 |  |  |  |  |  |  |  |  |  |  |
Under recovered amount, percent |  |  |  |  |  |  |  | 9.90% |  |  |  |  |  |  |  |  |  |  |
Public utilities, deferred requested rate Increase amount |  |  |  |  |  |  |  | $ 92,000,000 |  |  |  |  |  |  |  |  |  |  |
Supplemental requested decrease |  |  |  |  |  |  |  | 267,000,000 |  |  |  |  |  |  |  |  |  |  |
Public utilities, requested under recovery, not recovered, amount |  |  |  |  |  |  |  | $ 75,600,000 |  |  |  |  |  |  |  |  |  |  |
Carrying charge, percent |  |  |  |  |  |  |  | 0.04 |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  | $ 55,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Recovery amounts |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
West Virginia | Expanded Net Energy Cost Through 2026 | WVPSC | MP and PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  | $ 184,000,000 |  |  |  |  |  |  |  |  |  |  |  |

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