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REGULATORY MATTERS - Maryland and New Jersey (Details) |  |  |  |  |  |  |  |  | 1 Months Ended
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Jul. 17, 2023 USD ($) | Jun. 02, 2023 USD ($) | 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 ($) | Apr. 30, 2021 USD ($)
Maryland |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Increase base distribution rate |  |  |  | $ 19,800,000 |  |  |  |  |
PE |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Increase base distribution rate |  |  |  | 29,300,000 |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  | $ 50,400,000 |  |  |  |  |
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% |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  | $ 148,000,000 |  |  |  |  |
Recovery period for expenditures for cost recovery program |  |  |  | 3 years |  |  |  |  |
PE | Maryland | Power Purchase Agreements |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Annual termination fee |  |  | $ 51,000,000 |  |  |  |  |  |
Amount of termination fee |  |  | 357,000,000 |  |  |  |  |  |
Expected savings of ending the program |  |  | 80,000,000 |  |  |  |  |  |
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 |  |  |  |  |
JCP&L | New Jersey |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  | $ 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 prior to approval date |  |  | 50.00% |  |  |  |  |  |
JCP&L | New Jersey | NJBPU |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Requested increase to ROE |  |  |  |  |  |  | 9.60% |  |
Amount of revenue increase |  |  |  |  |  |  |  | $ 94,000,000 |
JCP&L | New Jersey | NJBPU | Subsequent Event |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) | $ 31,000,000 |  |  |  |  |  |  |  |
JCP&L | New Jersey | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | NJBPU | Regulated Distribution |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Increase base distribution rate |  | $ 193 |  |  | $ 185,000,000 |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  |  |  | $ 203,000,000
Number of proposed programs | program |  |  |  |  | 2 |  |  |  |
Approved period of rate plan |  |  |  |  |  |  |  |  | 3 years
Approved investment recovery |  |  |  |  |  |  |  |  | $ 160,000,000
Approved amount of operation and maintenance recovery |  |  |  |  |  |  |  |  | $ 43,000,000
JCP&L | New Jersey | Energy Efficiency and Peak Demand Reduction | NJBPU | Regulated Distribution |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  | 10 years

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