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Derivative Instruments (Details Textuals) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) agreement | Sep. 30, 2018 USD ($) agreement | Dec. 31, 2017 USD ($) agreement
Cash Flow Hedges |  |  |
Derivative [Line Items] |  |  |
Unamortized losses associated with prior interest rate hedges | $ 16,000,000 | $ 16,000,000 | $ 22,000,000
Gains (losses) to be amortized to interest expenses during next twelve months |  | $ (3,000,000) |
Number of outstanding commodity or interest rate derivatives | agreement | 0 | 0 | 0
Fair Value Hedging |  |  |
Derivative [Line Items] |  |  |
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 | $ 2,000,000 | $ 2,000,000 | $ 3,000,000
NUGs |  |  |
Derivative [Line Items] |  |  |
Liability position | 52,000,000 | 52,000,000 | 79,000,000
Settlements | 9,000,000 | 25,000,000 |
Unrealized gain (loss) | 4,000,000 | 2,000,000 |
FTRs |  |  |
Derivative [Line Items] |  |  |
Settlements | 0 | (3,000,000) |
Unrealized gain (loss) | 9,000,000 | 9,000,000 |
Net asset position | $ 9,000,000 | $ 9,000,000 | $ 3,000,000

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