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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Millions | Mar. 31, 2018 USD ($) $ / $ | Mar. 31, 2018 CAD ($) $ / $
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Forward exchange contracts that exchange CAD for USD maturing in 2018 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 161 | $ 208
Average exchange rate (cad per usd) | 1.29 | 1.29
Forward exchange contracts that exchange USD for CAD maturing in 2018 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 382 | $ 491
Average exchange rate (cad per usd) | 1.29 | 1.29
Forward exchange contracts that exchange USD for CAD maturing in 2019 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 21 | $ 27
Average exchange rate (cad per usd) | 1.28 | 1.28

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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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- Details
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- Details
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- Details
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