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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) CAD in Millions, $ in Millions	Dec. 31, 2015 CAD CAD / $	Dec. 31, 2015 USD ($) CAD / $
Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.38 maturing in 2016
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	CAD 207	$ 150
Average exchange rate	1.38	1.38
Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.33 maturing in 2016
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	CAD 291	$ 219
Average exchange rate	1.33	1.33

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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X

- References

No definition available.

+ Details

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X

- Details

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- Details

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