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Regulatory Matters - Maryland and New Jersey (Details)
$ in Millions
 3 Months Ended 36 Months Ended
Dec. 12, 2016
USD ($)
Jul. 16, 2015
Feb. 27, 2013
USD ($)
Mar. 31, 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       $ 47  
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  
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