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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details)
CAD in Millions, $ in Millions
Jun. 30, 2016
CAD
CAD / $
Jun. 30, 2016
USD ($)
CAD / $
Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.29 maturing in 2016    
Currency Exchange Rate Risk Hedging:    
Notional amount of derivatives CAD 25 $ 19
Average exchange rate 1.29 1.29
Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.29 maturing in 2016    
Currency Exchange Rate Risk Hedging:    
Notional amount of derivatives CAD 241 $ 186
Average exchange rate 1.29 1.29
Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.29 maturing in 2017    
Currency Exchange Rate Risk Hedging:    
Notional amount of derivatives CAD 26 $ 20
Average exchange rate 1.29 1.29