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Regulatory Matters - Maryland and New Jersey (Details) meter in Millions, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended
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Oct. 16, 2020 USD ($) | Sep. 25, 2020 USD ($) | Sep. 22, 2020 | Sep. 01, 2020 USD ($) | Aug. 27, 2020 USD ($) meter | Jun. 02, 2020 USD ($) | Apr. 06, 2020 USD ($) MW | Feb. 18, 2020 USD ($) | May 08, 2019 USD ($) rate_adjustment | Mar. 22, 2019 USD ($) program | Aug. 24, 2018 USD ($) program | Jan. 19, 2018 USD ($) | Sep. 30, 2020 USD ($) MW
Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  |  |  | 3,790
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 requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  | $ 19.7 |  |
Cost of charging equipment rebates |  |  |  |  |  |  |  |  |  |  |  | $ 12.0 |
Charging equipment rebates amortization period |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Number of enhanced service reliability programs | program |  |  |  |  |  |  |  |  |  |  | 4 |  |
Approved amount of annual increase (decrease) |  |  |  |  |  |  |  |  |  |  | $ 17.6 |  |
Revised requested rate increase |  |  |  |  |  |  |  |  |  |  | $ 7.3 |  |
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 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in depreciation rate |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
JCP&L | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) (percent) |  |  |  |  |  |  |  | 7.80% |  |  |  |  |
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 requested rate increase (decrease) |  |  |  |  |  | $ 185.0 |  | $ 186.9 |  |  |  |  |
JCP&L | NJBPU | New Jersey | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Requested increase to ROE | 9.60% |  |  |  |  |  |  |  |  |  |  |  |
Amount of revenue increase | $ 94.0 |  |  |  |  |  |  |  |  |  |  |  |
Decrease in regulatory liability | $ 86.0 |  |  |  |  |  |  |  |  |  |  |  |
JCP&L | NJBPU | JCP&L Reliability Plus | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Planned capital expenditures |  |  |  |  |  |  |  |  | $ 97.0 |  |  |  |
Processes for rate adjustments | rate_adjustment |  |  |  |  |  |  |  |  | 2 |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  | $ 230.0 |  |  |  |  |  |  |  |  |  |  |
Yard's Creek Energy | Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Plant capacity (in MW's) | MW |  |  |  |  |  |  |  |  |  |  |  |  | 210
Yard's Creek Energy | JCP&L | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Plant capacity (in MW's) | MW |  |  |  |  |  |  | 210 |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 155.0 |  |  |  |  |  |
Yard's Creek Energy | JCP&L | New Jersey | Regulated Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Book value |  |  |  |  |  |  |  |  |  |  |  |  | $ 44.0
Yard's Creek Energy | JCP&L | NJBPU | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  |  | 50.00% |  |  |  |  |  |

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