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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Millions | Jun. 30, 2019 USD ($) $ / $ | Jun. 30, 2019 CAD ($) $ / $
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Forward exchange contracts that exchange CAD for USD maturing in 2019 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 63 | $ 83
Average exchange rate (cad per usd) | 1.32 | 1.32
Forward exchange contracts that exchange USD for CAD maturing in 2019 |  |
Currency Exchange Rate Risk Hedging: |  |
Notional amount of derivatives | $ 165 | $ 220
Average exchange rate (cad per usd) | 1.33 | 1.33

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