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Regulatory Matters - Maryland and New Jersey (Details) meter in Millions, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2021 | Apr. 09, 2021 USD ($) | Mar. 05, 2021 USD ($) | Mar. 01, 2021 USD ($) program | Jan. 29, 2021 USD ($) | Jan. 01, 2021 USD ($) | Dec. 18, 2020 USD ($) | Sep. 25, 2020 USD ($) program | Aug. 27, 2020 USD ($) meter | Jun. 10, 2020 | Apr. 06, 2020 USD ($) MW | Mar. 22, 2019 USD ($) program | Mar. 31, 2021 USD ($) MW | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of Yards Creek (Note 8) |  |  |  |  |  |  |  |  |  |  |  |  | $ 109.0 | $ 0.0 |
Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  |  |  | 3,580 |  |
PE | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental energy savings goal per year (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |
Incremental energy savings goal thereafter (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |
Recovery period for expenditures for cost recovery program |  |  |  |  |  |  | 3 years |  |  |  |  |  | 3 years |  |
Expenditures for cost recovery program |  |  |  |  |  |  |  |  |  |  |  |  | $ 116.0 |  |
Amortization period |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  | $ 148.0 |  |  |  |  |  |  |  |
PE | MPSC | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of approved annual rate increase |  |  |  |  |  |  |  |  |  |  |  | $ 6.2 |  |  |
Number of enhanced service reliability programs | program |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Enhanced service reliability program term |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Period to file new depreciation study |  |  |  |  |  |  |  |  |  |  |  | 18 months |  |  |
Enhanced service reliability program renewal period |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
PE | MPSC | Maryland | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution reporting of COVID relief funds |  | $ 30.0 |  |  |  |  |  |  |  |  |  |  |  |  |
PE | MPSC | Depreciation Expense Study | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  | $ (9.6) |  |  |  |  |  |  |  |  |  |
PE | Maryland Office of People's Counsel | Depreciation Expense Study | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  | $ (10.8) |  |  |  |  |  |  |  |  |  |
JCP&L | New Jersey | Yard's Creek Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  | 210 |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  | $ 155.0 |  |  |  |
JCP&L | New Jersey | Regulated Distribution | Yard's Creek Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45.0
Gain on sale of Yards Creek (Note 8) |  |  | $ 109.0 |  |  |  |  |  |  |  |  |  |  |  |
JCP&L | Advanced Metering Infrastructure | New Jersey | Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  |  |  | $ 732.0 |  |  |  |  |  |
JCP&L | NJBPU | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of revenue increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.0
Decrease in regulatory liability |  |  |  |  |  | $ 86.0 |  |  |  |  |  |  |  |  |
JCP&L | NJBPU | New Jersey | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested increase to ROE | 9.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |
JCP&L | NJBPU | New Jersey | Yard's Creek Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
JCP&L | NJBPU | JCP&L Reliability Plus | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 95.0
JCP&L | NJBPU | Advanced Metering Infrastructure | New Jersey | Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Meter deployment period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Number of meters to be deployed | meter |  |  |  |  |  |  |  |  | 1.2 |  |  |  |  |  |
Expected cost of the program |  |  |  |  |  |  |  |  | $ 418.0 |  |  |  |  |  |
Time period of the program |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |
JCP&L | NJBPU | Energy Efficiency and Peak Demand Reduction | New Jersey | Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  |  |  |  |  | $ 230.0 |  |  |  |  |  |  |
Number of programs | program |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |
JCP&L | NJBPU | Electrical Vehicle Program | New Jersey | Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  | $ 50.0 |  |  |  |  |  |  |  |  |  |  |
Number of programs | program |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |
Electric vehicle program period |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Amount of requested return on capital |  |  |  | $ 16.0 |  |  |  |  |  |  |  |  |  |  |
Requested amount for operations and maintenance expense |  |  |  | $ 34.0 |  |  |  |  |  |  |  |  |  |  |

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