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Derivative Instruments (Details Textuals) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) agreement | Dec. 31, 2015 USD ($) agreement
Derivative [Line Items] |  |
Gains included in long-term debt associated with prior fixed-for-floating interest rate swap agreements | $ 10 | $ 20
Expected adverse change in quoted market prices of derivative instruments | 10.00% |
Decrease net income due to adverse change in commodity prices | $ 29 |
NUGs |  |
Derivative [Line Items] |  |
Liability position | 107 |
FTRs |  |
Derivative [Line Items] |  |
Net asset position under commodity derivative contracts | 1 |
Collateral posted | 1 |
Cash Flow Hedges |  |
Derivative [Line Items] |  |
Unamortized gains or (losses) associated with designated cash flow hedges | (12) | (11)
Unamortized gains or (losses) associated with prior interest rate hedges | (33) | $ (42)
Gains (losses) to be amortized to interest expenses during next twelve months | $ (8) |
Number of forward starting swap agreements accounted for as a cash flow hedge outstanding | agreement | 0 | 0
Fair Value Hedging |  |
Derivative [Line Items] |  |
Gains (losses) to be amortized to interest expenses during next twelve months | $ (7) |
Reclassifications from long-term debt | $ 10 | $ 12
Number of fixed-for-floating interest rate swap agreements outstanding | agreement | 0 | 0
Interest rate swaps |  |
Derivative [Line Items] |  |
Number of interest rate swaps outstanding | agreement | 0 | 0
FES | Commodity contracts |  |
Derivative [Line Items] |  |
Net asset position under commodity derivative contracts | $ 86 |
Collateral posted | 52 |
FES | FTRs |  |
Derivative [Line Items] |  |
Collateral posted | 5 |
FES | Cash Flow Hedges |  |
Derivative [Line Items] |  |
Unamortized gains or (losses) associated with prior interest rate hedges | $ (3) | $ (3)

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