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REGULATORY MATTERS - Pennsylvania and West Virginia (Details) $ in Millions |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jul. 11, 2025 | Mar. 14, 2025 | Feb. 26, 2025 USD ($) | Jan. 17, 2025 | Jul. 22, 2024 USD ($) | Dec. 08, 2023 auditMatter | Apr. 24, 2023 site MW | May 01, 2022 MW | Feb. 24, 2022 | Dec. 31, 2022 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
Transmission Related Vegetation Management Programs | FERC | FE |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Utilities reclassification to operating expense |  |  |  |  |  |  |  |  |  | $ 105 |  |
Utilities cooperate support |  |  |  |  |  |  |  |  |  |  | $ 98 |
Public utilities, number of unresolved audit matters | auditMatter |  |  |  |  |  | 2 |  |  |  |  |  |
Utilities, transmission owning utilities join an RTO |  |  |  |  |  |  |  |  | 0.00500000 |  |  |
Transmission Related Vegetation Management Programs | FERC | JERSEY CENTRAL POWER & LIGHT COMPANY | FE |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Utilities reclassification to operating expense |  |  |  |  |  |  |  |  |  | $ 13 |  |
Transmission ROE Incentive | FERC |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Utilities, transmission owing utilities join an RTO |  |  |  | 0.00500000 |  |  |  |  |  |  |  |
Public utilities, amount awarded from other party |  |  |  |  |  |  |  |  |  |  |  | $ 46
Transmission ROE Incentive | FERC | Miscellaneous Income |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, amount awarded from other party |  |  |  |  |  |  |  |  |  |  |  | 4
Transmission ROE Incentive | FERC | Transmission | Transmission Revenues |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, amount awarded from other party |  |  |  |  |  |  |  |  |  |  |  | $ 42
PJM 2024 RTEP Window 1 | Valley Link Transmission Rate |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Transmission solutions to the reliability issues |  |  | $ 3,000 |  |  |  |  |  |  |  |  |
Capital structure, percentage |  | 40.00% |  |  |  |  |  |  |  |  |  |
Equity ratio, percentage |  | 60.00% |  |  |  |  |  |  |  |  |  |
Transmission rate, base ROE |  | 10.90% |  |  |  |  |  |  |  |  |  |
PJM 2024 RTEP Window 1 | Valley Link Transmission Rate | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recovery of project abandonment costs (percent) | 50.00% |  |  |  |  |  |  |  |  |  |  |
Recovery of project abandonment costs incurred thereafter (percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |
Pennsylvania | EE&C Phase IV | PPUC |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, approved energy consumption reduction targets, cost recovery |  |  |  |  |  |  |  |  |  |  | $ 390 |
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] |  |  |  |  |  |  |  |  |  |  |  |
Proposed investment amount |  |  |  |  | $ 1,600 |  |  |  |  |  |  |
Pennsylvania | 2025-2029 LTIIP | PPUC | Pennsylvania Companies |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proposed investment amount |  |  |  |  | $ 1,400 |  |  |  |  |  |  |
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 |  |  |  |
Number of approved solar sites | site |  |  |  |  |  |  | 3 |  |  |  |  |
Public Utilities, Number of Overall Solar Sites | site |  |  |  |  |  |  | 5 |  |  |  |  |

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