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Regulatory Matters - Maryland and New Jersey (Details)
$ in Millions
 9 Months Ended 36 Months Ended
Nov. 02, 2016
USD ($)
Apr. 28, 2016
USD ($)
Jul. 16, 2015
Feb. 27, 2013
USD ($)
Sep. 30, 2016
USD ($)
component
bgs
Dec. 31, 2017
USD ($)
Maryland            
Regulatory Matters [Line Items]            
Expenditures for cost recovery program incurred         $ 38.0  
Incremental energy savings goal next 12 months (percent)     0.20%      
Incremental energy savings goal thereafter (percent)     2.00%      
Recovery period for expenditures for cost recovery program     5 years   3 years  
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  
Number of basic generation services | bgs         1  
JCP&L | NJBPU | New Jersey            
Regulatory Matters [Line Items]            
Amount of requested rate increase (decrease)   $ 142.1     $ 146.6  
Scenario, Forecast | Maryland            
Regulatory Matters [Line Items]            
Expenditures for cost recovery program           $ 68.0
Subsequent Event | JCP&L | NJBPU | New Jersey            
Regulatory Matters [Line Items]            
Approved amount of annual increase $ 80.0