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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, 2016 USD ($) contract CAD / $	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 CAD contract CAD / $
Currency Exchange Rate Risk Hedging:
Net derivative liability	$ 131	$ 72
Gain on embedded derivative	30	$ 0	$ 0
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	$ 274			CAD 363
Average exchange rate | CAD / $	1.33			1.33
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	$ 492			CAD 652
Average exchange rate | CAD / $	1.33			1.33
Series A Preferred Units | Embedded derivative financial instruments
Currency Exchange Rate Risk Hedging:
Net derivative liability	$ 32
Gain on embedded derivative	$ 30
Cash Flow Hedging | 8 Forward Starting 30 Year Interest Rate Swap One
Currency Exchange Rate Risk Hedging:
Number of interest rate derivatives held | contract	8			8
Notional amount of derivatives	$ 200
Average Rate Locked	3.14%			3.14%
Cash Flow Hedging | 8 Forward Starting 30 Year Interest Rate Swap Two
Currency Exchange Rate Risk Hedging:
Number of interest rate derivatives held | contract	8			8
Notional amount of derivatives	$ 200
Average Rate Locked	3.20%			3.20%
Cash Flow Hedging | 8 Forward Starting 30 Year Interest Rate Swap Three
Currency Exchange Rate Risk Hedging:
Number of interest rate derivatives held | contract	8			8
Notional amount of derivatives	$ 200
Average Rate Locked	2.83%			2.83%

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

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