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REGULATORY MATTERS - Maryland and New Jersey (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Feb. 01, 2024 USD ($) circuit | Jan. 03, 2024 USD ($) | Dec. 29, 2023 USD ($) | Dec. 05, 2023 USD ($) | Dec. 01, 2023 USD ($) program | Nov. 09, 2023 USD ($) | Oct. 31, 2023 MW windFarm | Oct. 18, 2023 USD ($) | Aug. 07, 2023 USD ($) | Aug. 01, 2023 USD ($) | Jul. 17, 2023 USD ($) | Apr. 17, 2023 USD ($) | Mar. 22, 2023 USD ($) program | Mar. 16, 2023 USD ($) program | Oct. 26, 2022 USD ($) | Nov. 01, 2021 | Oct. 28, 2020 USD ($) | Apr. 30, 2021 USD ($) | Dec. 31, 2023
Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase base distribution rate |  |  |  |  |  |  |  | $ 28,000,000 |  |  |  |  |  |  |  |  |  |  |
Maryland | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase base distribution rate |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,400,000 |  |  |  |  |  |
PE | FERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Support costs |  |  |  |  |  |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |  |
PE | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of service reliability and resiliency programs | program |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Number of programs | program |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Incremental energy savings goal per year (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |  |  |  |  |
Incremental energy savings goal thereafter (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
PE | Maryland | Power Purchase Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual termination fee |  |  |  |  |  |  |  |  |  |  |  | $ 51,000,000 |  |  |  |  |  |  |
Amount of termination fee |  |  |  |  |  |  |  |  |  |  |  | 357,000,000 |  |  |  |  |  |  |
PE | Maryland | Power Purchase Agreements | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of termination fee |  |  |  |  |  |  |  |  |  |  |  | 55,000,000 |  |  |  |  |  |  |
PE | Maryland | Power Purchase Agreements | Other Noncurrent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of termination fee |  |  |  |  |  |  |  |  |  |  |  | $ 302,000,000 |  |  |  |  |  |  |
PE | Maryland | 2021-2023 EmPOWER Program Cycle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
PE | Maryland | 2024-2026 EmPOWER Program Cycle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period for expenditures for cost recovery program |  |  |  |  |  |  |  |  |  | 3 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 |  |  |  |  |  |  |  |  |
Public utilities, requested year one |  |  |  |  |  |  |  |  |  | $ 310,000,000 |  |  |  |  |  |  |  |  |
Public utilities, requested year two |  |  |  |  |  |  |  |  |  | 354,000,000 |  |  |  |  |  |  |  |  |
Public utilities, requested year three |  |  |  |  |  |  |  |  |  | $ 510,000,000 |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  |  | $ 310,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JCP And L | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 723,000,000 |  |  |  |
Approved 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 |  |  |  |  |  |  |  |  |  |  |  |
JCP And L | New Jersey | NJBPU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  |  |  |  |  |  |  |  | $ 31,000,000 |  |  |  |  |  |  |  |
Amount of revenue increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 94,000,000 |  |
Requested increase to ROE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.60% |  |  |
JCP And L | New Jersey | NJBPU | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | Utilities and Transmission Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  | $ 69,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 203,000,000 |
Increase base distribution rate |  |  |  |  |  |  |  |  | $ 192,000,000 |  |  |  |  | $ 185,000,000 |  |  |  |  |
Number of proposed programs | program |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
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 |
Number of extension period |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revised requested rate increase |  |  |  |  | $ 964,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of energy program | program |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of peak demand reduction program | program |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Building decarbonization program | program |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
JCP And L | New Jersey | NJBPU | Energy Efficiency and Peak Demand Reduction | Utilities and Transmission Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |
JCP And L | New Jersey | Subsequent Event | NJBPU | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | Utilities and Transmission Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase base distribution rate | $ 85,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining amount of regulatory liability amortization | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial investment | $ 95 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of high-priority circuits | circuit | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JCP&L |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved ROE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.60%
JCP&L | New Jersey | NJBPU | Energy Efficiency and Peak Demand Reduction | Utilities and Transmission Companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase |  |  |  |  |  | $ 935,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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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