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Derivative Instruments (Details Textuals) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) agreement | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) agreement | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Derivative [Line Items] |  |  |  |  |
Unamortized gains or losses associated with designated cash flow hedges | $ 11 |  | $ 11 |  | $ 11
Collateral received | $ 22 |  | $ 22 |  | 0
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 |  |  | $ (37) |  |
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 |  |
Unamortized gains or losses associated with prior interest rate hedges | $ 35 |  | 35 |  | 42
Gains (losses) to be amortized to interest expenses during next twelve months |  |  | (8) |  |
Fair Value Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gains (losses) to be amortized to interest expenses during next twelve months |  |  | $ 8 |  |
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 | $ 12 |  | $ 12 |  | 20
Reclassifications from long-term debt | 2 | $ 3 | 8 | $ 9 |
Commodity contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net asset position under commodity derivative contracts | 103 |  | 103 |  |
Collateral received | 22 |  | 22 |  | 0
Commodity contracts | FES |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Collateral posted | 9 |  | 9 |  |
Collateral received | 22 |  | 22 |  |
NUGs |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Collateral received | 0 |  | 0 |  | 0
Liability position | 118 |  | 118 |  |
FTRs |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net asset position under commodity derivative contracts | 6 |  | 6 |  |
Collateral received | 0 |  | 0 |  | $ 0
FTRs | FES |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net asset position under commodity derivative contracts | 2 |  | 2 |  |
Collateral posted | $ 7 |  | $ 7 |  |

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