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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) CAD in Millions, $ in Millions | Sep. 30, 2017 USD ($) CAD / $ | Sep. 30, 2017 CAD CAD / $
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Forward exchange contracts that exchange CAD for USD maturing in 2017 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 174 | CAD 215
Average exchange rate (cad per usd) | 1.24 | 1.24
Forward exchange contracts that exchange CAD for USD maturing in 2018 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 12 | CAD 15
Average exchange rate (cad per usd) | 1.22 | 1.22
Forward exchange contracts that exchange USD for CAD maturing in 2017 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 307 | CAD 385
Average exchange rate (cad per usd) | 1.26 | 1.26
Forward exchange contracts that exchange USD for CAD maturing in 2018 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 118 | CAD 147
Average exchange rate (cad per usd) | 1.25 | 1.25

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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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- References No definition available. + Details
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