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Regulatory Matters - Maryland and New Jersey (Details) $ in Millions |  |  |  |  | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 19, 2018 USD ($) rebate | Dec. 12, 2016 USD ($) | Jul. 16, 2015 | Feb. 27, 2013 USD ($) | Dec. 31, 2017 component | Dec. 31, 2020 USD ($) | Dec. 31, 2017 USD ($) component | Feb. 15, 2018 USD ($)
Maryland |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Expected infrastructure investments |  |  |  | $ 2,700 |  |  |  |
Expected infrastructure investments, period |  |  |  | 15 years |  |  |  |
New Jersey |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Number of supply components | component |  |  |  |  | 2 |  | 2 |
PE | Maryland |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
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% |  |  |  |  |
Expenditures for cost recovery program incurred |  |  |  |  |  |  | $ 60 |
Amortization period for expenditures for cost recovery program |  |  |  |  | 5 years |  |  |
JCP&L | New Jersey | NJBPU |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Requested increase in revenues |  | $ 80 |  |  |  |  |  |
Forecast | PE | Maryland |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Expenditures for cost recovery program |  |  |  |  |  | $ 116 |  |
Recovery period for expenditures for cost recovery program |  |  |  |  |  | 3 years |  |
Subsequent Event | PE | MDPSC |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Charging equipment rebates amortization period | 5 years |  |  |  |  |  |  |
Subsequent Event | PE | Maryland | MDPSC | Minimum |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Impact on base rate due to Tax Act |  |  |  |  |  |  |  | $ 7
Subsequent Event | PE | Maryland | MDPSC | Maximum |  |  |  |  |  |  |  |
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |
Impact on base rate due to Tax Act |  |  |  |  |  |  |  | $ 8

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