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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)

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- Definition Possible Adverse Percentage Change Threshold In Quoted Market Prices Derivative Instruments + References No definition available. + Details
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- Definition Unamortized gains included in long-term debt associated with prior fixed-for-floating interest rate swap agreements. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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