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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Millions	Mar. 31, 2018 USD ($) $ / $	Mar. 31, 2018 CAD ($) $ / $
Forward exchange contracts that exchange CAD for USD maturing in 2018
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 161	$ 208
Average exchange rate (cad per usd)	1.29	1.29
Forward exchange contracts that exchange USD for CAD maturing in 2018
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 382	$ 491
Average exchange rate (cad per usd)	1.29	1.29
Forward exchange contracts that exchange USD for CAD maturing in 2019
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 21	$ 27
Average exchange rate (cad per usd)	1.28	1.28

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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- Details

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- Details

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- Details

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