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Derivative Instruments (Details Textuals)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
agreement
Dec. 31, 2016
USD ($)
agreement
Derivative [Line Items]    
Unamortized gains or losses associated with designated cash flow hedges $ 11 $ 12
Possible adverse change in quoted market prices of derivative instruments 10.00%  
Possible increase (decrease) net income due to ten percent adverse change in commodity prices $ (14)  
Cash Flow Hedges    
Derivative [Line Items]    
Less than 1 million dollar loss on cash flow hedge expected to be reclassified to earnings in next twelve months 2  
Unamortized gains or losses associated with prior interest rate hedges 31 $ 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
Cash Flow Hedges | FES    
Derivative [Line Items]    
Unamortized gains or losses associated with prior interest rate hedges $ 3 $ 3
Fair Value Hedging    
Derivative [Line Items]    
Gains (losses) to be amortized to interest expenses during next twelve months $ 5  
Number of fixed-for-floating interest rate swap agreements outstanding | agreement 0 0
Gains included in long-term debt associated with prior fixed-for-floating interest rate swap agreements $ 8 $ 10
Commodity contracts    
Derivative [Line Items]    
Net asset position under commodity derivative contracts 34  
Commodity contracts | FES    
Derivative [Line Items]    
Collateral posted 1  
NUGs    
Derivative [Line Items]    
Liability position 103  
FTRs    
Derivative [Line Items]    
Derivative assets (liabilities) (4) 1
FTRs | FES    
Derivative [Line Items]    
Derivative assets (liabilities) $ (2) $ (1)