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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) CAD in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) contract CAD / $ | Dec. 31, 2016 USD ($) | Dec. 31, 2017 CAD contract CAD / $
Currency Exchange Rate Risk Hedging: |  |  |
Gain on embedded derivative | $ 13 | $ 30 |
16 forward starting swaps (30-year) | Cash Flow Hedging |  |  |
Currency Exchange Rate Risk Hedging: |  |  |
Number of interest rate derivatives | contract | 16 |  | 16
Term of derivative contract | 30 years |  |
Notional amount of derivatives | $ 400 |  |
Average rate locked (percent) | 2.86% |  | 2.86%
8 forward starting swaps (30-year) | Cash Flow Hedging |  |  |
Currency Exchange Rate Risk Hedging: |  |  |
Number of interest rate derivatives | contract | 8 |  | 8
Term of derivative contract | 30 years |  |
Notional amount of derivatives | $ 200 |  |
Average rate locked (percent) | 2.83% |  | 2.83%
Forward exchange contracts that exchange CAD for USD maturing in 2018 |  |  |
Currency Exchange Rate Risk Hedging: |  |  |
Notional amount of derivatives | $ 87 |  | CAD 109
Average exchange rate (cad per usd) | CAD / $ | 1.26 |  | 1.26
Forward exchange contracts that exchange USD for CAD maturing in 2018 |  |  |
Currency Exchange Rate Risk Hedging: |  |  |
Notional amount of derivatives | $ 645 |  | CAD 816
Average exchange rate (cad per usd) | CAD / $ | 1.27 |  | 1.27
Preferred Distribution Rate Reset Option | Series A Preferred Units |  |  |
Currency Exchange Rate Risk Hedging: |  |  |
Net derivative liability | $ 22 | 32 |
Gain on embedded derivative | $ 13 | $ 30 |

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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