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Derivatives and Risk Management Activities (Details 3) CAD in Millions, $ in Millions | Sep. 30, 2015 CAD CAD / $ | Sep. 30, 2015 USD ($) CAD / $
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Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.33 maturing in 2015 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | CAD 202 | $ 152
Average exchange rate | 1.33 | 1.33
Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.33 maturing in 2016 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | CAD 76 | $ 57
Average exchange rate | 1.33 | 1.33
Forward exchange contracts that exchange CAD for USD |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | CAD 278 | $ 209
Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.28 maturing in 2015 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | CAD 222 | $ 173
Average exchange rate | 1.28 | 1.28
Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.28 maturing in 2016 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | CAD 73 | $ 57
Average exchange rate | 1.28 | 1.28
Forward exchange contracts that exchange USD for CAD |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | CAD 295 | $ 230

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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 contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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