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Regulatory Matters - Maryland and New Jersey (Details)
$ in Millions
 9 Months Ended 33 Months Ended 36 Months Ended
Dec. 12, 2016
USD ($)
Jul. 16, 2015
Feb. 27, 2013
USD ($)
Sep. 30, 2017
component
Sep. 30, 2017
USD ($)
component
Dec. 31, 2020
USD ($)
Dec. 31, 2017
USD ($)
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   0.97%          
Incremental energy savings goal thereafter   0.20%          
Incremental energy savings goal   2.00%          
Expenditures for cost recovery program incurred         $ 56    
Recovery period for expenditures for cost recovery program   5 years   3 years      
Expected infrastructure investments     $ 2,700        
Period of expected infrastructure investments     15 years        
JCP&L | NJBPU | New Jersey              
Regulatory Matters [Line Items]              
Approved amount of annual increase $ 80            
Scenario, Forecast | PE | Maryland              
Regulatory Matters [Line Items]              
Expenditures for cost recovery program           $ 116 $ 70
Recovery period for expenditures for cost recovery program           3 years