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Regulatory Matters - Maryland and New Jersey (Details)
$ in Millions
 6 Months Ended
Jun. 02, 2020
USD ($)
Apr. 06, 2020
USD ($)
MW
Feb. 18, 2020
May 08, 2019
USD ($)
rate_adjustment
Mar. 22, 2019
USD ($)
program
Aug. 24, 2018
USD ($)
program
Jan. 19, 2018
USD ($)
Jun. 30, 2020
USD ($)
MW
Regulated Distribution                
Regulatory Matters [Line Items]                
Plant capacity (in MW's) | MW               3,790
PE | Maryland                
Regulatory Matters [Line Items]                
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
Expenditures for cost recovery program               $ 116.0
Amortization period               5 years
PE | MPSC | Maryland                
Regulatory Matters [Line Items]                
Cost of charging equipment rebates             $ 12.0  
Charging equipment rebates amortization period             5 years  
Amount of requested rate increase (decrease)           $ 19.7    
Number of enhanced service reliability programs | program           4    
Approved amount of annual increase (decrease)           $ 17.6    
Revised requested rate increase           $ 7.3    
Amount of approved annual rate increase         $ 6.2      
Number of enhanced service reliability programs | program         3      
Enhanced service reliability program term         4 years      
Period to file new depreciation study         18 months      
Enhanced service reliability program renewal period         4 years      
JCP&L | New Jersey                
Regulatory Matters [Line Items]                
Amount of requested rate increase (decrease) (percent)     7.80%          
JCP&L | NJBPU | New Jersey                
Regulatory Matters [Line Items]                
Amount of requested rate increase (decrease) $ 185.0              
JCP&L | NJBPU | JCP&L Reliability Plus | New Jersey                
Regulatory Matters [Line Items]                
Planned capital expenditures       $ 97.0        
Processes for rate adjustments | rate_adjustment       2        
Yard's Creek Energy | Regulated Distribution                
Regulatory Matters [Line Items]                
Ownership interest acquired               50.00%
Plant capacity (in MW's) | MW               210
Yard's Creek Energy | JCP&L | New Jersey                
Regulatory Matters [Line Items]                
Plant capacity (in MW's) | MW   210            
Purchase price   $ 155.0            
Yard's Creek Energy | JCP&L | New Jersey | Regulated Distribution                
Regulatory Matters [Line Items]                
Book value               $ 44.0
Yard's Creek Energy | JCP&L | NJBPU | New Jersey                
Regulatory Matters [Line Items]                
Ownership interest acquired   50.00%