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Regulatory Matters - Maryland and New Jersey (Details) $ in Millions |  |  |  |  |  |  |  |  |  | 9 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 05, 2018 USD ($) | Aug. 24, 2018 USD ($) program | Aug. 17, 2018 USD ($) | Jul. 13, 2018 USD ($) | Mar. 26, 2018 USD ($) | Jan. 19, 2018 USD ($) rebate | Dec. 12, 2016 USD ($) | Jul. 16, 2015 | Feb. 27, 2013 USD ($) | Sep. 30, 2018 component | Dec. 31, 2020 USD ($) | Feb. 15, 2018 USD ($)
Maryland |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expected infrastructure investments |  |  |  |  |  |  |  |  | $ 2,700.0 |  |  |
Period of expected infrastructure investments |  |  |  |  |  |  |  |  | 15 years |  |  |
New Jersey |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of supply components | component |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
PE | Maryland |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recovery period for expenditures for cost recovery program |  |  |  |  |  |  |  |  |  | 3 years |  |
Incremental energy savings goal in the next 12 months (percent) |  |  |  |  |  |  |  | 0.97% |  |  |  |
Incremental energy savings goal per year (percent) |  |  |  |  |  |  |  | 0.20% |  |  |  |
Incremental energy savings goal thereafter (percent) |  |  |  |  |  |  |  | 2.00% |  |  |  |
Amortization period |  |  |  |  |  |  |  |  |  | 5 years |  |
PE | MPSC |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of residential charging equipment rebates | rebate |  |  |  |  |  | 2,000 |  |  |  |  |  |
Number of commercial charging equipment rebates | rebate |  |  |  |  |  | 259 |  |  |  |  |  |
Cost of charging equipment rebates |  |  |  |  |  | $ 12.0 |  |  |  |  |  |
Charging equipment rebates amortization period |  |  |  |  |  | 5 years |  |  |  |  |  |
PE | MPSC | Maryland |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase (decrease) |  |  | $ (6.5) |  |  |  |  |  |  |  |  |
Amount of requested rate increase (decrease) |  | $ 19.7 |  |  |  |  |  |  |  |  |  |
Number of enhanced service reliability programs | program |  | 4 |  |  |  |  |  |  |  |  |  |
Revised requested rate increase |  | $ 7.3 |  |  |  |  |  |  |  |  |  |
JCP&L | NJBPU | New Jersey |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase (decrease) |  |  |  |  | $ (28.6) |  | $ 80.0 |  |  |  |  |
Approved rider due to change in tax rate |  |  |  |  | $ 1.3 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
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 |
Subsequent Event | PE | MPSC | Maryland |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved amount of annual increase (decrease) | $ (5.0) |  |  |  |  |  |  |  |  |  |  |
Minimum | PE | MPSC | Maryland |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact on base rate |  |  |  |  |  |  |  |  |  |  |  | $ 7.0
Maximum | PE | MPSC | Maryland |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact on base rate |  |  |  |  |  |  |  |  |  |  |  | $ 8.0

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