Regulatory Matters - Maryland and New Jersey (Details) meter in Millions, $ in Millions							3 Months Ended
	Nov. 01, 2021	Sep. 14, 2021 USD ($)	Apr. 23, 2021 USD ($)	Mar. 01, 2021 USD ($) program	Oct. 28, 2020 USD ($)	Aug. 27, 2020 USD ($) meter	Mar. 31, 2022 USD ($)
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
Amount of requested rate increase (decrease)							$ 148
Recovery period for expenditures for cost recovery program							3 years
JCP&L | Advanced Metering Infrastructure | New Jersey | Regulated Distribution
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)						$ 732
JCP&L | Advanced Metering Infrastructure Supplemental Filing | New Jersey | Regulated Distribution
Regulatory Matters [Line Items]
First period of the program		6 years
Costs associated with program		$ 494
Amount of capital expenditures		390
Amount of maintenance expense		73
Cost of removal		$ 31
JCP&L | NJBPU | New Jersey
Regulatory Matters [Line Items]
Requested increase to ROE	9.60%
Amount of revenue increase					$ 94
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
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
JCP&L | NJBPU | Electrical Vehicle Program | New Jersey | Regulated Distribution
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)				$ 50
Number of programs | program				6
Electric vehicle program period				4 years
Amount of requested return on capital				$ 16
Requested amount for operations and maintenance expense				$ 34
JCP&L | NJBPU | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | New Jersey | Regulated Distribution
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)			$ 203
Approved period of rate plan			3 years
Approved investment recovery			$ 158
Approved amount of operation and maintenance recovery			$ 45