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Derivative Instruments (Details Textuals) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) agreement | Dec. 31, 2018 USD ($) agreement
Cash Flow Hedges |  |
Derivative [Line Items] |  |
Unamortized losses associated with prior interest rate hedges | $ 14 | $ 15
Gains (losses) to be amortized to interest expenses during next twelve months | $ (2) |
Number of outstanding commodity or interest rate derivatives | agreement | 0 | 0
Fair Value Hedging |  |
Derivative [Line Items] |  |
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 | $ 2 | $ 2
NUGs |  |
Derivative [Line Items] |  |
Liability position | 41 | 44
Settlements | 10 |
Unrealized gain (loss) | (7) |
FTRs |  |
Derivative [Line Items] |  |
Settlements | (10) |
Net asset position | $ (1) | $ 9

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- Definition Settled Contracts. + References No definition available. + Details
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- Definition Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 + Details
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