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REGULATORY MATTERS - Maryland and New Jersey (Details)
$ in Millions
 1 Months Ended
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 ($)
Apr. 30, 2021
USD ($)
PE              
Regulatory Matters [Line Items]              
Amount of requested rate increase (decrease)   $ 44          
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          
Recovery period for expenditures for cost recovery program   3 years          
PE | Maryland | Power Purchase Agreements | Subsequent Event              
Regulatory Matters [Line Items]              
Annual termination fee $ 51            
Amount of termination fee 357            
Expected savings of ending the program $ 80            
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      
Approved ROE       10.20%      
Public utility, offshore development, percent       20.00%      
JCP&L | New Jersey | Subsequent Event              
Regulatory Matters [Line Items]              
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  
JCP&L | New Jersey | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | NJBPU | Regulated Distribution              
Regulatory Matters [Line Items]              
Increase base distribution rate     $ 185        
Amount of requested rate increase (decrease)             $ 203
Number of proposed programs | program     2        
Approved period of rate plan             3 years
Approved investment recovery             $ 160
Approved amount of operation and maintenance recovery             $ 43
JCP&L | New Jersey | Energy Efficiency and Peak Demand Reduction | NJBPU | Regulated Distribution              
Regulatory Matters [Line Items]              
Amortization period             10 years