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REGULATORY MATTERS - Maryland and New Jersey (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Oct. 18, 2024 USD ($) | Aug. 15, 2024 USD ($) | Jul. 01, 2024 USD ($) | May 22, 2024 USD ($) | Mar. 21, 2024 | Feb. 27, 2024 USD ($) | Feb. 01, 2024 USD ($) circuit | Dec. 29, 2023 USD ($) | Dec. 01, 2023 USD ($) program | Nov. 09, 2023 USD ($) | Oct. 31, 2023 MW windFarm | Oct. 19, 2023 | Aug. 01, 2023 USD ($) scenario | Apr. 17, 2023 | Oct. 26, 2022 USD ($) | Apr. 30, 2021 USD ($) | Dec. 31, 2024 | Mar. 31, 2024 USD ($)
FERC | Integrated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax impairment of regulatory asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 53,000,000
PE | Integrated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed ROE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.45% |
JCP&L |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed ROE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.60% |
JCP&L | Integrated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed ROE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.20% |
Maryland | PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental energy savings goal per year (percent) |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |  |  |  |  |
Incremental energy savings goal thereafter (percent) |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Maryland | PE | Per Year 2022 Through 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental energy savings goal thereafter (percent) |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maryland | PE | Per Year 2025 And 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental energy savings goal thereafter (percent) |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Maryland | PE | Per Year 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental energy savings goal thereafter (percent) |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Maryland | PE | 2024-2026 EmPOWER Program Cycle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of scenarios with projected costs submitted for cost recovery program | scenario |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Recovery period for expenditures for cost recovery program |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Public utilities, requested year one |  |  |  |  |  |  |  |  |  |  |  |  | $ 311,000,000 |  |  |  |  |
Public utilities, requested year two |  |  |  |  |  |  |  |  |  |  |  |  | 354,000,000 |  |  |  |  |
Public utilities, requested year three |  |  |  |  |  |  |  |  |  |  |  |  | $ 510,000,000 |  |  |  |  |
Approved amount of rate increase (decrease) |  |  |  |  |  |  |  | $ 311,000,000 |  |  |  |  |  |  |  |  |  |
Public utilities, revised requested rate, amount |  | $ 314,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Public utilities, requested cost percentage, year one |  |  |  |  |  |  |  |  |  |  |  |  | 0.33 |  |  |  |  |
Public utilities, requested cost percentage, year two |  |  |  |  |  |  |  |  |  |  |  |  | 0.67 |  |  |  |  |
Public utilities, requested cost percentage, year three |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Maryland | PE | 2024-2030 EmPOWER Program Cycle | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, expected reduction to pre-tax return on programs |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maryland | PE | 2024-2030 EmPOWER Program Cycle | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, expected reduction to pre-tax return on programs |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Jersey | JCP And L |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 723,000,000 |  |  |
Allowed ROE |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.20% |  |  |
Public utility, offshore development, percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Recovery of transmission incentive rates, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Recovery of transmission incentive rates, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Number of cease development | windFarm |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  | 2,248 |  |  |  |  |  |  |
New Jersey | JCP And L | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | NJBPU | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extension period |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  | $ 69,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 203,000,000 |  |
Public utilities, amended, amount of investments | $ 784,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested increase to ROE | 9.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, requested equity capital structure, percentage | 52.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revised requested rate increase | $ 817,000,000 |  |  |  |  |  |  |  | $ 964,000,000 |  |  |  |  |  |  |  |  |
Number of energy program | program |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Number of peak demand reduction program | program |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Building decarbonization program | program |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Remaining amount of regulatory liability amortization |  |  |  |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of high-priority circuits | circuit |  |  |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |
Initial investment |  |  |  |  |  |  | $ 95,000,000 |  |  |  |  |  |  |  |  |  |  |
Approved rate plan period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Approved amount of investment recovery over amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 160,000,000 |  |
Approved amount of operation costs and maintenance recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,000,000 |  |
New Jersey | JCP And L | Energy Efficiency and Peak Demand Reduction | NJBPU | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
New Jersey | JCP&L | Energy Efficiency and Peak Demand Reduction | NJBPU | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  |  |  | $ 930,500,000 |  |  |  | $ 935,000,000 |  |  |  |  |  |  |  |
Recovery period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase, capital commitments |  |  |  |  |  |  |  |  |  | 906,000,000 |  |  |  |  |  |  |  |
Amount of requested rate increase, operating and maintenance expense |  |  |  |  |  |  |  |  |  | $ 29,000,000 |  |  |  |  |  |  |  |

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