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Regulatory Matters - Maryland and New Jersey (Details)
meter in Millions, $ in Millions
 3 Months Ended 6 Months Ended
May 02, 2022
USD ($)
Nov. 01, 2021
Sep. 14, 2021
USD ($)
meter
Apr. 23, 2021
USD ($)
Mar. 01, 2021
program
Oct. 28, 2020
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2022
PE | Maryland                
Regulatory Matters [Line Items]                
Incremental energy savings goal per year (percent)               0.20%
Incremental energy savings goal thereafter (percent)               2.00%
Amortization period               5 years
Amount of requested rate increase (decrease)             $ 148  
Recovery period for expenditures for cost recovery program             3 years  
JCP&L | Advanced Metering Infrastructure Supplemental Filing | New Jersey | Regulated Distribution                
Regulatory Matters [Line Items]                
First period of the program     6 years          
Costs associated with program     $ 494          
Amount of capital expenditures     390          
Amount of maintenance expense     73          
Cost of removal     $ 31          
JCP&L | NJBPU | New Jersey                
Regulatory Matters [Line Items]                
Requested increase to ROE   9.60%            
Amount of revenue increase           $ 94    
JCP&L | NJBPU | Advanced Metering Infrastructure | New Jersey | Regulated Distribution                
Regulatory Matters [Line Items]                
Number of meters to be deployed | meter     1.2          
JCP&L | NJBPU | Energy Efficiency and Peak Demand Reduction | New Jersey | Regulated Distribution                
Regulatory Matters [Line Items]                
Amortization period       10 years        
JCP&L | NJBPU | Electrical Vehicle Program | New Jersey | Regulated Distribution                
Regulatory Matters [Line Items]                
Electric vehicle program period         4 years      
Number of programs | program         6      
Public Utilities, Approved Budget, Amount $ 40              
Approved return on capital 29              
Approved amount for operations and maintenance expense $ 11              
JCP&L | NJBPU | Energy Efficiency and Peak Demand Reduction Stipulation Settlement | New Jersey | Regulated Distribution                
Regulatory Matters [Line Items]                
Amount of requested rate increase (decrease)       $ 203        
Approved period of rate plan       3 years        
Approved investment recovery       $ 158        
Approved amount of operation and maintenance recovery       $ 45