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Regulatory Matters - Maryland and New Jersey (Details)
$ in Millions
 3 Months Ended
Apr. 06, 2020
USD ($)
MW
Feb. 18, 2020
USD ($)
May 08, 2019
USD ($)
rate_adjustment
Mar. 22, 2019
USD ($)
program
Aug. 24, 2018
USD ($)
program
Jan. 19, 2018
USD ($)
Mar. 31, 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)   $ 186.9          
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, LLC Hydro Generation Facility | JCP&L | New Jersey | Subsequent Event              
Regulatory Matters [Line Items]              
Plant capacity (in MW's) | MW 210            
Purchase price $ 155.0            
Yard's Creek Energy, LLC Hydro Generation Facility | JCP&L | New Jersey | Regulated Distribution | Subsequent Event              
Regulatory Matters [Line Items]              
Book value $ 44.0            
Yard's Creek Energy, LLC Hydro Generation Facility | JCP&L | NJBPU | New Jersey | Subsequent Event              
Regulatory Matters [Line Items]              
Ownership interest acquired 50.00%