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Derivative Instruments (Narrative) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivative Instruments [Abstract] |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 8,000,000 |  |
Cash flow hedge, reclassified to earnings, net | 0 | $ 0 |
Non-performance Risk Adjustment | 0 |  |
Exposure Associated With Collateralization Events | $ 0 |  | $ 0

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- Definition Cash flow hedge, reclassified to earnings, net + References No definition available. + Details
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- Definition Amount of exposure associated with collateral support agreements in certain transactions that require the posting of collateral when net exposures exceed predetermined thresholds. + References No definition available. + Details
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- Definition Credit, or nonperformance, risk adjustment associated with credit loss in the event of nonperformance by our counterparties on various derivative contracts. + 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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- References No definition available. + Details
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