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REGULATORY MATTERS - Maryland and New Jersey (Details)																1 Months Ended	12 Months Ended
	Oct. 18, 2024 USD ($)	Aug. 15, 2024 USD ($)	Jul. 01, 2024 USD ($)	May 22, 2024 USD ($)	Mar. 21, 2024	Feb. 27, 2024 USD ($)	Feb. 01, 2024 USD ($) circuit	Dec. 29, 2023 USD ($)	Dec. 01, 2023 USD ($) program	Nov. 09, 2023 USD ($)	Oct. 31, 2023 MW windFarm	Oct. 19, 2023	Aug. 01, 2023 USD ($) scenario	Apr. 17, 2023	Oct. 26, 2022 USD ($)	Apr. 30, 2021 USD ($)	Dec. 31, 2024	Mar. 31, 2024 USD ($)
FERC | Integrated
Regulatory Matters [Line Items]
Pre-tax impairment of regulatory asset																		$ 53,000,000
PE | Integrated
Regulatory Matters [Line Items]
Allowed ROE																	10.45%
JCP&L
Regulatory Matters [Line Items]
Allowed ROE																	9.60%
JCP&L | Integrated
Regulatory Matters [Line Items]
Allowed ROE																	10.20%
Maryland | PE
Regulatory Matters [Line Items]
Incremental energy savings goal per year (percent)												0.20%
Incremental energy savings goal thereafter (percent)												2.00%
Maryland | PE | Per Year 2022 Through 2024
Regulatory Matters [Line Items]
Incremental energy savings goal thereafter (percent)					2.00%
Maryland | PE | Per Year 2025 And 2026
Regulatory Matters [Line Items]
Incremental energy savings goal thereafter (percent)					2.25%
Maryland | PE | Per Year 2027
Regulatory Matters [Line Items]
Incremental energy savings goal thereafter (percent)					2.50%
Maryland | PE | 2024-2026 EmPOWER Program Cycle
Regulatory Matters [Line Items]
Number of scenarios with projected costs submitted for cost recovery program | scenario													3
Recovery period for expenditures for cost recovery program													3 years
Public utilities, requested year one													$ 311,000,000
Public utilities, requested year two													354,000,000
Public utilities, requested year three													$ 510,000,000
Approved amount of rate increase (decrease)								$ 311,000,000
Public utilities, revised requested rate, amount		$ 314,000,000
Amortization period																	5 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
Maryland | PE | 2024-2030 EmPOWER Program Cycle | Minimum
Regulatory Matters [Line Items]
Public utilities, expected reduction to pre-tax return on programs			$ 25,000,000
Maryland | PE | 2024-2030 EmPOWER Program Cycle | Maximum
Regulatory Matters [Line Items]
Public utilities, expected reduction to pre-tax return on programs			$ 30,000,000
New Jersey | JCP And L
Regulatory Matters [Line Items]
Approved amount of rate increase (decrease)															$ 723,000,000
Allowed ROE															10.20%
Public utility, offshore development, percent															20.00%
Recovery of transmission incentive rates, percentage														100.00%
Recovery of transmission incentive rates, percentage														50.00%
Number of cease development | windFarm											2
Plant capacity (in MW's) | MW											2,248
New Jersey | JCP And L | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | NJBPU | Distribution
Regulatory Matters [Line Items]
Number of extension period				6 months
Amount of requested rate increase				$ 69,000,000												$ 203,000,000
Public utilities, amended, amount of investments	$ 784,000,000
Requested increase to ROE	9.60%
Public utilities, requested equity capital structure, percentage	52.00%
Recovery period	10 years
Revised requested rate increase	$ 817,000,000								$ 964,000,000
Number of energy program | program									10
Number of peak demand reduction program | program									1
Building decarbonization program | program									1
Remaining amount of regulatory liability amortization							$ 18,000,000
Number of high-priority circuits | circuit							18
Initial investment							$ 95,000,000
Approved rate plan period																3 years
Approved amount of investment recovery over amortization period																$ 160,000,000
Approved amount of operation costs and maintenance recovery																$ 43,000,000
New Jersey | JCP And L | Energy Efficiency and Peak Demand Reduction | NJBPU | Distribution
Regulatory Matters [Line Items]
Amortization period																10 years
New Jersey | JCP&L | Energy Efficiency and Peak Demand Reduction | NJBPU | Distribution
Regulatory Matters [Line Items]
Amount of requested rate increase						$ 930,500,000				$ 935,000,000
Recovery period						5 years
Amount of requested rate increase, capital commitments										906,000,000
Amount of requested rate increase, operating and maintenance expense										$ 29,000,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147478458/980-340-35-1

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