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Regulatory Matters - Maryland and New Jersey (Details)
$ in Millions
 3 Months Ended 36 Months Ended
Apr. 23, 2019
USD ($)
rate_adjustment
Mar. 22, 2019
USD ($)
program
Oct. 05, 2018
USD ($)
Aug. 24, 2018
USD ($)
program
Jul. 13, 2018
USD ($)
Mar. 26, 2018
USD ($)
Jan. 19, 2018
USD ($)
Jul. 16, 2015
Feb. 27, 2013
USD ($)
Mar. 31, 2019
Dec. 31, 2020
USD ($)
Feb. 15, 2018
USD ($)
Maryland                        
Regulatory Matters [Line Items]                        
Expected infrastructure investments                 $ 2,700.0      
Period of expected infrastructure investments                 15 years      
PE | Maryland                        
Regulatory Matters [Line Items]                        
Incremental energy savings goal in the next 12 months (percent)               0.97%        
Incremental energy savings goal per year (percent)               0.20%        
Incremental energy savings goal thereafter (percent)               2.00%        
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                
Approved amount of annual increase (decrease)   $ (3.0) $ (5.0) $ 18.0                
Number of enhanced service reliability programs | program       4                
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 | NJBPU | New Jersey                        
Regulatory Matters [Line Items]                        
Approved amount of annual increase (decrease)           $ (28.6)            
Approved rider due to change in tax rate           $ 1.3            
JCP&L | NJBPU | JCP&L Reliability Plus                        
Regulatory Matters [Line Items]                        
Amount of requested rate increase (decrease)         $ 386.8              
JCP&L | NJBPU | JCP&L Reliability Plus | New Jersey                        
Regulatory Matters [Line Items]                        
Infrastructure investment period         4 years              
Scenario, Forecast | PE | Maryland                        
Regulatory Matters [Line Items]                        
Recovery period for expenditures for cost recovery program                     3 years  
Expenditures for cost recovery program                     $ 116.0  
Minimum | PE | MPSC | Maryland                        
Regulatory Matters [Line Items]                        
Impact on base rate                       $ 7.0
Maximum | PE | MPSC | Maryland                        
Regulatory Matters [Line Items]                        
Impact on base rate                       $ 8.0
Subsequent Event | JCP&L | NJBPU | JCP&L Reliability Plus | New Jersey                        
Regulatory Matters [Line Items]                        
Approved amount of annual increase (decrease) $ 97.0                      
Processes for rate adjustments | rate_adjustment 2