REGULATORY MATTERS - Maryland and New Jersey (Details) meter in Millions, $ in Millions							1 Months Ended	12 Months Ended	36 Months Ended
	Sep. 17, 2022 USD ($)	May 02, 2022 USD ($)	Sep. 14, 2021 USD ($) meter	Mar. 01, 2021 program	Oct. 28, 2020 USD ($)	Jul. 16, 2015	Apr. 30, 2021 USD ($)	Dec. 31, 2022	Dec. 31, 2020 USD ($)
PE | Maryland
Regulatory Matters [Line Items]
Incremental energy savings goal per year (percent)						0.20%
Incremental energy savings goal thereafter (percent)						2.00%
PE | Maryland | 2021-2023 EmPOWER Program Cycle
Regulatory Matters [Line Items]
Expenditures for cost recovery program									$ 148
Recovery period for expenditures for cost recovery program									3 years
Amortization period for expenditures for cost recovery program								5 years
JCP&L | New Jersey
Regulatory Matters [Line Items]
Requested ROE	10.20%
Transmission infrastructure cost	$ 723
Public utility, offshore development, percent	20.00%
JCP&L | New Jersey | Regulated Distribution | Advanced Metering Infrastructure Supplemental Filing
Regulatory Matters [Line Items]
Meter program period			6 years
Requested rate increase due to costs associated with program			$ 494
Requested increase due to capital expenditures			390
Requested increase due to maintenance expense			73
Cost of removal			$ 31
JCP&L | New Jersey | NJBPU
Regulatory Matters [Line Items]
Settled amount of increase in revenue					$ 94
Requested ROE					9.60%
JCP&L | New Jersey | NJBPU | Regulated Distribution | Energy Efficiency and Peak Demand Reduction Stipulation Settlement
Regulatory Matters [Line Items]
Requested rate increase (decrease)							$ (203)
Approved rate plan period							3 years
Approved amount of investment recovery over amortization period							$ 158
Approved amount of operation costs and maintenance recovery							$ 45
JCP&L | New Jersey | NJBPU | Regulated Distribution | Energy Efficiency and Peak Demand Reduction
Regulatory Matters [Line Items]
Amortization period for expenditures for cost recovery program							10 years
JCP&L | New Jersey | NJBPU | Regulated Distribution | Electrical Vehicle Program
Regulatory Matters [Line Items]
Electric vehicle program period				4 years
Number of programs | program				6
Public Utilities, Approved Budget, Amount		$ 40
Public Utilities, Approved Return on Equity, Amount		29
Public Utilities, Approved Rate Increase (Decrease), Apportioned for Operations and Maintenance Expense, Amount		$ 11
JCP&L | New Jersey | NJBPU | Regulated Distribution | Advanced metering infrastructure
Regulatory Matters [Line Items]
Number of meters to be deployed | meter			1.2
Deployment period			3 years