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Regulatory Matters - Maryland and New Jersey (Details) $ in Millions |  |  |  |  |  |  |  | 9 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 23, 2019 USD ($) rate_adjustment | Mar. 22, 2019 USD ($) program | Aug. 24, 2018 USD ($) program | Jul. 13, 2018 USD ($) | Mar. 26, 2018 USD ($) | Jan. 19, 2018 USD ($) | Jul. 16, 2015 | Sep. 30, 2019 | Dec. 31, 2020 USD ($)
PE | Maryland |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Incremental energy savings goal per year (percent) |  |  |  |  |  |  | 0.20% |  |
Incremental energy savings goal thereafter (percent) |  |  |  |  |  |  | 2.00% |  |
Amortization period |  |  |  |  |  |  |  | 5 years |
PE | MPSC | Maryland |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Cost of charging equipment rebates |  |  |  |  |  | $ 12.0 |  |  |
Charging equipment rebates amortization period |  |  |  |  |  | 5 years |  |  |
Amount of requested rate increase (decrease) |  |  | $ 19.7 |  |  |  |  |  |
Approved amount of annual increase (decrease) |  |  | $ 17.6 |  |  |  |  |  |
Number of enhanced service reliability programs | program |  |  | 4 |  |  |  |  |  |
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 |  |  |  |  |  |  |
JCP&L | NJBPU | New Jersey |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Approved amount of annual increase (decrease) | $ (28.6) |  |  |  | $ (28.6) |  |  |  |
Approved rider due to change in tax rate |  |  |  |  | $ 1.3 |  |  |  |
Approved amount of rate refund | 7.0 |  |  |  |  |  |  |  |
JCP&L | NJBPU | JCP&L Reliability Plus |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  |  |  | $ 386.8 |  |  |  |  |
JCP&L | NJBPU | JCP&L Reliability Plus | New Jersey |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Approved amount of annual increase (decrease) | $ 97.0 |  |  |  |  |  |  |  |
Processes for rate adjustments | rate_adjustment | 2 |  |  |  |  |  |  |  |
Infrastructure investment period |  |  |  | 4 years |  |  |  |  |
Scenario, Forecast | PE | Maryland |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |
Recovery period for expenditures for cost recovery program |  |  |  |  |  |  |  |  | 3 years
Expenditures for cost recovery program |  |  |  |  |  |  |  |  | $ 116.0

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