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Derivative Instruments (Details Textuals)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
agreement
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
agreement
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
agreement
Derivative [Line Items]          
Unamortized losses associated with designated cash flow hedges $ 11   $ 11   $ 12
Possible adverse change in quoted market prices of derivative instruments 10.00%   10.00%    
Possible increase (decrease) net income due to ten percent adverse change in commodity prices     $ (6)    
Cash Flow Hedges          
Derivative [Line Items]          
Cash flow hedge losses expected to be reclassified to earnings in next twelve months     2    
Unamortized losses associated with prior interest rate hedges $ 27   27   $ 33
Gains (losses) to be amortized to interest expenses during next twelve months     $ (8)    
Number of outstanding commodity or interest rate derivatives | agreement 0   0   0
Cash Flow Hedges | FES          
Derivative [Line Items]          
Unamortized losses associated with prior interest rate hedges $ 3   $ 3   $ 3
Fair Value Hedging          
Derivative [Line Items]          
Gains (losses) to be amortized to interest expenses during next twelve months     $ 2    
Number of fixed-for-floating interest rate swap agreements outstanding | agreement 0   0   0
Gains included in long-term debt associated with prior fixed-for-floating interest rate swap agreements $ 4   $ 4   $ 10
Reclassifications from long-term debt 1 $ 2 6 $ 8  
Commodity contracts          
Derivative [Line Items]          
Net asset (liability) position 23   23    
Commodity contracts | FES          
Derivative [Line Items]          
Collateral posted 1   1    
NUGs          
Derivative [Line Items]          
Liability position 92   92    
FTRs          
Derivative [Line Items]          
Net asset (liability) position 3   3   1
FTRs | FES          
Derivative [Line Items]          
Net asset (liability) position $ (1)   $ (1)   $ (1)