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Derivative Instruments (Details Textuals)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
agreement
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
agreement
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
agreement
Derivative [Line Items]          
Unamortized gains or losses associated with designated cash flow hedges $ 12   $ 12   $ 11
Gains included in long-term debt associated with prior fixed-for-floating interest rate swap agreements         20
Collateral received $ 3   $ 3   $ 0
Possible adverse change in quoted market prices of derivative instruments 10.00%   10.00%    
Possible decrease net income due to ten percent adverse change in commodity prices     $ (33)    
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     $ 1    
Number of forward starting swap agreements accounted for as a cash flow hedge outstanding | agreement 0   0   0
Unamortized gains or losses associated with prior interest rate hedges $ 37   $ 37   $ 42
Gains (losses) to be amortized to interest expenses during next twelve months     (8)    
Number of outstanding commodity or interest rate derivatives | agreement         0
Fair Value Hedging          
Derivative [Line Items]          
Gains (losses) to be amortized to interest expenses during next twelve months     $ 9    
Number of outstanding commodity or interest rate derivatives | agreement 0   0   0
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 $ 15   $ 15    
Reclassifications from long-term debt 3 $ 3 6 $ 6  
Commodity contracts          
Derivative [Line Items]          
Net asset position under commodity derivative contracts 86   86    
Collateral received 3   3   $ 0
Commodity contracts | FES          
Derivative [Line Items]          
Net asset position under commodity derivative contracts 86   86    
Collateral posted 6   6    
Collateral received 3   3    
Additional collateral related to commodity derivatives 4   4    
NUGs          
Derivative [Line Items]          
Collateral received 0   0   0
Liability position 123   123    
FTRs          
Derivative [Line Items]          
Net asset position under commodity derivative contracts 9   9    
Collateral received 0   0   $ 0
FTRs | FES          
Derivative [Line Items]          
Net asset position under commodity derivative contracts 7   7    
Collateral posted $ 10   $ 10