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REGULATORY MATTERS - Maryland and New Jersey (Details) meter in Millions, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended | 36 Months Ended
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Jan. 29, 2021 USD ($) | Dec. 18, 2020 USD ($) | Nov. 01, 2020 USD ($) | Oct. 16, 2020 USD ($) | Sep. 25, 2020 USD ($) | Sep. 22, 2020 USD ($) | Aug. 27, 2020 USD ($) meter | Jun. 02, 2020 USD ($) | Apr. 06, 2020 USD ($) MW | Feb. 18, 2020 USD ($) | Mar. 23, 2019 USD ($) | Mar. 22, 2019 program | Dec. 17, 2018 USD ($) | Oct. 22, 2018 USD ($) | Aug. 24, 2018 USD ($) program | Jan. 19, 2018 USD ($) | Jul. 16, 2015 | Dec. 31, 2020 USD ($) MW | Dec. 31, 2020 USD ($) MW
Utilities and FET |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,790 | 3,790
Yard's Creek Energy, LLC Hydro Generation Facility | Utilities and FET |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 210 | 210
Ownership interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
PE | MDPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of charging equipment rebates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.0 |  |  |
Charging equipment rebates amortization period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
PE | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental energy savings goal per year (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |
Incremental energy savings goal thereafter (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
PE | Maryland | MDPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested increase (decrease) in revenues |  |  |  |  |  |  |  |  |  |  | $ 6.2 |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (19.7) |  |  |  |
Number of enhanced service reliability programs | program |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |
Revised requested rate increase |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17.6 |  |  |  |  |
Number of approved ESR programs | program |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
ESR program term |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Period to file new depreciation study |  |  |  |  |  |  |  |  |  |  |  | 18 months |  |  |  |  |  |  |
ESER Program rate case renewal period |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Revised rate increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.3 |  |  |  |
JCP&L | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (percent) |  |  |  |  |  |  |  |  |  | 7.80% |  |  |  |  |  |  |  |  |
JCP&L | New Jersey | Yard's Creek Energy, LLC Hydro Generation Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant generation capacity (in MW's) | MW |  |  |  |  |  |  |  |  | 210 |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  | $ 155.0 |  |  |  |  |  |  |  |  |  |
JCP&L | New Jersey | Yard's Creek Energy, LLC Hydro Generation Facility | Utilities and FET |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45.0 | $ 45.0
JCP&L | New Jersey | NJBPU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  | $ (185.0) |  | $ (186.9) |  |  |  |  |  |  |  |  |
Settled amount of increase in revenue |  |  |  | $ 94.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested ROE |  |  |  | 9.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settled decrease in regulatory liability |  |  |  | $ 86.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JCP&L | New Jersey | NJBPU | Yard's Creek Energy, LLC Hydro Generation Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
JCP&L Reliability Plus | JCP&L | New Jersey | NJBPU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested increase (decrease) in revenues |  |  | $ 95.1 |  |  |  |  |  |  |  |  |  | $ 97.0 |  |  |  |  |  |
2021-2023 EmPOWER Program Cycle | PE | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period for expenditures for cost recovery program |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for cost recovery program |  | $ 148.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018-2020 EmPOWER Program Cycle | PE | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery period for expenditures for cost recovery program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years
Expenditures for cost recovery program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 116.0
Amortization period for expenditures for cost recovery program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Advanced metering infrastructure | JCP&L | New Jersey | Utilities and FET |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  | $ (732.0) |  |  |  |  |  |  |  |  |  |  |  |
Advanced metering infrastructure | JCP&L | New Jersey | NJBPU | Utilities and FET |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected cost of the program |  |  |  |  |  |  | $ 418.0 |  |  |  |  |  |  |  |  |  |  |  |
Meter deployment program period |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |
Deployment period |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Number of meters to be deployed | meter |  |  |  |  |  |  | 1.2 |  |  |  |  |  |  |  |  |  |  |  |
Energy Efficiency and Peak Demand Reduction | JCP&L | New Jersey | NJBPU | Utilities and FET |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  | $ (230.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation Study | PE | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation study findings |  |  |  |  |  | $ 36.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation Study | PE | Maryland | MDPSC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 9.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation Study | PE | Maryland | Maryland Office of People's Counsel | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 10.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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