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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) CAD in Millions, $ in Millions	Mar. 31, 2016 USD ($) CAD / $	Mar. 31, 2016 CAD CAD / $
Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.30 maturing in 2016
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 147	CAD 191
Average exchange rate	1.30	1.30
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	$ 228	CAD 302
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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Balance Type:	na
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X

- Details

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- Details

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