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Regulatory Matters - Maryland and New Jersey (Details)
$ in Millions
 6 Months Ended 30 Months Ended 36 Months Ended
Dec. 12, 2016
USD ($)
Jul. 16, 2015
Feb. 27, 2013
USD ($)
Jun. 30, 2017
component
Jun. 30, 2017
USD ($)
component
Dec. 31, 2017
USD ($)
Maryland            
Regulatory Matters [Line Items]            
Incremental energy savings goal next 12 months (percent)   0.20%        
Incremental energy savings goal thereafter (percent)   2.00%        
Expenditures for cost recovery program incurred         $ 52  
Recovery period for expenditures for cost recovery program   5 years   3 years    
Expected infrastructure investments     $ 2,700      
Period of expected infrastructure investments     15 years      
New Jersey            
Regulatory Matters [Line Items]            
Number of supply components | component       2 2  
PE | Maryland            
Regulatory Matters [Line Items]            
Incremental energy savings goal next 12 months (percent)   0.97%        
JCP&L | NJBPU | New Jersey            
Regulatory Matters [Line Items]            
Approved amount of annual increase $ 80          
Scenario, Forecast | Maryland            
Regulatory Matters [Line Items]            
Expenditures for cost recovery program           $ 70