REGULATORY MATTERS - Maryland and New Jersey (Details)											1 Months Ended
	Oct. 18, 2023 USD ($)	Aug. 07, 2023 USD ($)	Aug. 01, 2023 USD ($)	Jul. 17, 2023 USD ($)	Apr. 17, 2023 USD ($)	Mar. 22, 2023 USD ($) program	Mar. 16, 2023 USD ($) program	Oct. 26, 2022 USD ($)	Nov. 01, 2021	Oct. 28, 2020 USD ($)	Apr. 30, 2021 USD ($)
Maryland | Subsequent Event
Regulatory Matters [Line Items]
Increase base distribution rate	$ 28,000,000
PE
Regulatory Matters [Line Items]
Amount of requested rate increase						$ 50,400,000
PE | Subsequent Event | FERC
Regulatory Matters [Line Items]
Support costs	$ 12,000,000
PE | Maryland
Regulatory Matters [Line Items]
Amount of requested rate increase						$ 148,000,000
Number of service reliability and resiliency programs | program						3
Number of programs | program						2
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
PE | Maryland | Power Purchase Agreements
Regulatory Matters [Line Items]
Annual termination fee					$ 51,000,000
Amount of termination fee					357,000,000
Expected savings of ending the program					80,000,000
PE | Maryland | Power Purchase Agreements | Other Current Liabilities
Regulatory Matters [Line Items]
Amount of termination fee					55,000,000
PE | Maryland | Power Purchase Agreements | Other Noncurrent Liabilities
Regulatory Matters [Line Items]
Amount of termination fee					$ 302,000,000
PE | Maryland | 2021-2023 EmPOWER Program Cycle
Regulatory Matters [Line Items]
Amortization period						5 years
PE | Maryland | 2024-2026 EmPOWER Program Cycle
Regulatory Matters [Line Items]
Recovery period for expenditures for cost recovery program			3 years
Public utilities, requested cost percentage, year one			0.33
Public utilities, requested cost percentage, year two			0.67
Public utilities, requested cost percentage, year three			1
Public utilities, requested year one			$ 310,000,000
Public utilities, requested year two			354,000,000
Public utilities, requested year three			$ 510,000,000
JCP&L | NEW JERSEY
Regulatory Matters [Line Items]
Approved amount of annual increase								$ 723,000,000
Approved ROE								10.20%
Public utility, offshore development, percent								20.00%
Recovery of transmission incentive rates, percentage					100.00%
Recovery of transmission incentive rates prior to approval date					50.00%
JCP&L | NEW JERSEY | NJBPU
Regulatory Matters [Line Items]
Amount of requested rate increase				$ 31,000,000
Requested increase to ROE									9.60%
Amount of revenue increase										$ 94,000,000
JCP&L | NEW JERSEY | NJBPU | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | Regulated Distribution
Regulatory Matters [Line Items]
Amount of requested rate increase											$ 203,000,000
Increase base distribution rate		$ 192,000,000					$ 185,000,000
Number of proposed programs | program							2
Approved period of rate plan											3 years
Approved investment recovery											$ 160,000,000
Approved amount of operation and maintenance recovery											$ 43,000,000
JCP&L | NEW JERSEY | NJBPU | Energy Efficiency and Peak Demand Reduction | Regulated Distribution
Regulatory Matters [Line Items]
Amortization period											10 years