REGULATORY MATTERS - Maryland and New Jersey (Details)									1 Months Ended
	Jul. 17, 2023 USD ($)	Jun. 02, 2023 USD ($)	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
Regulatory Matters [Line Items]
Increase base distribution rate				$ 19,800,000
PE
Regulatory Matters [Line Items]
Increase base distribution rate				29,300,000
Amount of requested rate increase (decrease)				$ 50,400,000
PE | Maryland
Regulatory Matters [Line Items]
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%
Amount of requested rate increase (decrease)				$ 148,000,000
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
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]
Requested increase to ROE							9.60%
Amount of revenue increase								$ 94,000,000
JCP&L | New Jersey | NJBPU | Subsequent Event
Regulatory Matters [Line Items]
Amount of requested rate increase (decrease)	$ 31,000,000
JCP&L | New Jersey | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | NJBPU | Regulated Distribution
Regulatory Matters [Line Items]
Increase base distribution rate		$ 193			$ 185,000,000
Amount of requested rate increase (decrease)									$ 203,000,000
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 | Energy Efficiency and Peak Demand Reduction | NJBPU | Regulated Distribution
Regulatory Matters [Line Items]
Amortization period									10 years