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Regulatory Matters - Maryland and New Jersey (Details)
$ in Millions
 9 Months Ended 36 Months Ended
Oct. 05, 2018
USD ($)
Aug. 24, 2018
USD ($)
program
Aug. 17, 2018
USD ($)
Jul. 13, 2018
USD ($)
Mar. 26, 2018
USD ($)
Jan. 19, 2018
USD ($)
rebate
Dec. 12, 2016
USD ($)
Jul. 16, 2015
Feb. 27, 2013
USD ($)
Sep. 30, 2018
component
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      
New Jersey                        
Regulatory Matters [Line Items]                        
Number of supply components | component                   2,000,000    
PE | Maryland                        
Regulatory Matters [Line Items]                        
Recovery period for expenditures for cost recovery program                   3 years    
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                        
Regulatory Matters [Line Items]                        
Number of residential charging equipment rebates | rebate           2,000            
Number of commercial charging equipment rebates | rebate           259            
Cost of charging equipment rebates           $ 12.0            
Charging equipment rebates amortization period           5 years            
PE | MPSC | Maryland                        
Regulatory Matters [Line Items]                        
Approved amount of annual increase (decrease)     $ (6.5)                  
Amount of requested rate increase (decrease)   $ 19.7                    
Number of enhanced service reliability programs | program   4                    
Revised requested rate increase   $ 7.3                    
JCP&L | NJBPU | New Jersey                        
Regulatory Matters [Line Items]                        
Approved amount of annual increase (decrease)         $ (28.6)   $ 80.0          
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  
Subsequent Event | PE | MPSC | Maryland                        
Regulatory Matters [Line Items]                        
Approved amount of annual increase (decrease) $ (5.0)                      
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