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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 / $
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

X

- 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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X

- 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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