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Regulatory Matters - Maryland and New Jersey (Details) $ in Millions							6 Months Ended	36 Months Ended
	Jul. 13, 2018 USD ($)	Mar. 26, 2018 USD ($)	Jan. 19, 2018 USD ($) rebate	Dec. 12, 2016 USD ($)	Jul. 16, 2015	Feb. 27, 2013 USD ($)	Jun. 30, 2018 component	Dec. 31, 2020 USD ($)	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
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
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
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
Subsequent Event | JCP&L | NJBPU | JCP&L Reliability Plus
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)	$ 386.8
Subsequent Event | JCP&L | NJBPU | JCP&L Reliability Plus | New Jersey
Regulatory Matters [Line Items]
Infrastructure investment period	4 years

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