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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) CAD in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) contract CAD / $	Dec. 31, 2016 USD ($)	Dec. 31, 2017 CAD contract CAD / $
Currency Exchange Rate Risk Hedging:
Gain on embedded derivative	$ 13	$ 30
16 forward starting swaps (30-year) | Cash Flow Hedging
Currency Exchange Rate Risk Hedging:
Number of interest rate derivatives | contract	16		16
Term of derivative contract	30 years
Notional amount of derivatives	$ 400
Average rate locked (percent)	2.86%		2.86%
8 forward starting swaps (30-year) | Cash Flow Hedging
Currency Exchange Rate Risk Hedging:
Number of interest rate derivatives | contract	8		8
Term of derivative contract	30 years
Notional amount of derivatives	$ 200
Average rate locked (percent)	2.83%		2.83%
Forward exchange contracts that exchange CAD for USD maturing in 2018
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 87		CAD 109
Average exchange rate (cad per usd) | CAD / $	1.26		1.26
Forward exchange contracts that exchange USD for CAD maturing in 2018
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 645		CAD 816
Average exchange rate (cad per usd) | CAD / $	1.27		1.27
Preferred Distribution Rate Reset Option | Series A Preferred Units
Currency Exchange Rate Risk Hedging:
Net derivative liability	$ 22	32
Gain on embedded derivative	$ 13	$ 30

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- 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

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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