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Regulatory Matters - Maryland and New Jersey (Details) meter in Millions, $ in Millions																3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 01, 2021	Jun. 16, 2021 USD ($)	May 26, 2021 USD ($)	Apr. 23, 2021 USD ($)	Mar. 05, 2021 USD ($)	Mar. 01, 2021 USD ($) program	Jan. 29, 2021 USD ($)	Jan. 01, 2021 USD ($)	Dec. 18, 2020 USD ($)	Oct. 28, 2020 USD ($)	Sep. 25, 2020 USD ($) program	Aug. 27, 2020 USD ($) meter	Jun. 10, 2020	Apr. 06, 2020 USD ($) MW	Mar. 22, 2019 USD ($) program	Jun. 30, 2021 USD ($) MW	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) MW	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Regulatory Matters [Line Items]
Gain on sale of Yards Creek (Note 8)																$ 0.0	$ 0.0	$ 109.0	$ 0.0
Regulated Distribution
Regulatory Matters [Line Items]
Plant capacity (in MW's) | MW																3,580		3,580
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 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
Distribution reporting of COVID relief funds		$ 4.0
PE | MPSC | Depreciation Expense Study | Maryland
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)							$ (9.6)
PE | Maryland Office of People's Counsel | Depreciation Expense Study | Maryland
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)							$ (10.8)
Approved amount of annual increase			$ (2.1)
JCP&L | New Jersey | Yard's Creek Energy
Regulatory Matters [Line Items]
Plant capacity (in MW's) | MW														210
Purchase price														$ 155.0
JCP&L | New Jersey | Regulated Distribution | Yard's Creek Energy
Regulatory Matters [Line Items]
Book value																				$ 45.0
Gain on sale of Yards Creek (Note 8)					$ 109.0
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 revenue increase										$ 94.0
Decrease in regulatory liability								$ 86.0
JCP&L | NJBPU | New Jersey | Forecast
Regulatory Matters [Line Items]
Requested increase to ROE	9.60%
JCP&L | NJBPU | New Jersey | Yard's Creek Energy
Regulatory Matters [Line Items]
Ownership interest acquired														50.00%
JCP&L | NJBPU | JCP&L Reliability Plus | New Jersey
Regulatory Matters [Line Items]
Approved amount of annual increase																				$ 95.0
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]
Amortization period													10 years
Amount of requested rate increase (decrease)											$ 230.0
Approved amount of annual increase				$ 203.0
Approved period of rate plan				3 years
Number of programs | program											11
JCP&L | NJBPU | Electrical Vehicle Program | New Jersey | Regulated Distribution
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)						$ 50.0
Number of programs | program						6
Electric vehicle program period						4 years
Amount of requested return on capital						$ 16.0
Requested amount for operations and maintenance expense						$ 34.0

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