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Regulatory Matters - Maryland and New Jersey (Details)
$ in Millions
 12 Months Ended 36 Months Ended
Jan. 19, 2018
USD ($)
rebate
Dec. 12, 2016
USD ($)
Jul. 16, 2015
Feb. 27, 2013
USD ($)
Dec. 31, 2017
component
Dec. 31, 2020
USD ($)
Dec. 31, 2017
USD ($)
component
Feb. 15, 2018
USD ($)
Maryland                
Regulatory Matters [Line Items]                
Expected infrastructure investments       $ 2,700        
Expected infrastructure investments, period       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 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%          
Expenditures for cost recovery program incurred             $ 60  
Amortization period for expenditures for cost recovery program         5 years      
JCP&L | New Jersey | NJBPU                
Regulatory Matters [Line Items]                
Requested increase in revenues   $ 80            
Forecast | PE | Maryland                
Regulatory Matters [Line Items]                
Expenditures for cost recovery program           $ 116    
Recovery period for expenditures for cost recovery program           3 years    
Subsequent Event | PE | MDPSC                
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              
Charging equipment rebates amortization period 5 years              
Subsequent Event | PE | Maryland | MDPSC | Minimum                
Regulatory Matters [Line Items]                
Impact on base rate due to Tax Act               $ 7
Subsequent Event | PE | Maryland | MDPSC | Maximum                
Regulatory Matters [Line Items]                
Impact on base rate due to Tax Act               $ 8