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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, 2016 USD ($) contract CAD / $ | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 CAD contract CAD / $
Currency Exchange Rate Risk Hedging: |  |  |  |
Net derivative liability | $ 131 | $ 72 |  |
Gain on embedded derivative | 30 | $ 0 | $ 0 |
Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.38 maturing in 2016 |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Notional amount of derivatives | $ 274 |  |  | CAD 363
Average exchange rate | CAD / $ | 1.33 |  |  | 1.33
Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.33 maturing in 2016 |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Notional amount of derivatives | $ 492 |  |  | CAD 652
Average exchange rate | CAD / $ | 1.33 |  |  | 1.33
Series A Preferred Units | Embedded derivative financial instruments |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Net derivative liability | $ 32 |  |  |
Gain on embedded derivative | $ 30 |  |  |
Cash Flow Hedging | 8 Forward Starting 30 Year Interest Rate Swap One |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Number of interest rate derivatives held | contract | 8 |  |  | 8
Notional amount of derivatives | $ 200 |  |  |
Average Rate Locked | 3.14% |  |  | 3.14%
Cash Flow Hedging | 8 Forward Starting 30 Year Interest Rate Swap Two |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Number of interest rate derivatives held | contract | 8 |  |  | 8
Notional amount of derivatives | $ 200 |  |  |
Average Rate Locked | 3.20% |  |  | 3.20%
Cash Flow Hedging | 8 Forward Starting 30 Year Interest Rate Swap Three |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Number of interest rate derivatives held | contract | 8 |  |  | 8
Notional amount of derivatives | $ 200 |  |  |
Average Rate Locked | 2.83% |  |  | 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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