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Derivatives and Risk Management Activities - Interest Rate Risk Hedging (Details) - Cash flow hedge $ in Millions | 6 Months Ended
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Jun. 30, 2017 USD ($) contract
16 forward starting interest rate swaps (30-year), 2.86% |
Interest Rate Risk Hedging |
Number of interest rate derivatives | contract | 16
Term of derivative contract | 30 years
Notional amount of derivatives | $ | $ 400
Average rate locked (percent) | 2.86%
8 forward starting interest rate swaps (30-year), 2.83% |
Interest Rate Risk Hedging |
Number of interest rate derivatives | contract | 8
Term of derivative contract | 30 years
Notional amount of derivatives | $ | $ 200
Average rate locked (percent) | 2.83%

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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