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Derivatives and Risk Management Activities (Details 3) In Millions, unless otherwise specified	Dec. 31, 2013 Foreign exchange contracts CAD	Dec. 31, 2013 Foreign exchange forward contracts maturing in 2014 CAD	Dec. 31, 2013 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.06 maturing in 2014 USD ($)	Dec. 31, 2013 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.06 maturing in 2014 CAD	Dec. 31, 2013 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.07 maturing in 2015 USD ($)	Dec. 31, 2013 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.07 maturing in 2015 CAD	Dec. 31, 2013 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.06 USD ($)	Dec. 31, 2013 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.06 CAD	Dec. 31, 2013 Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.05 maturing in 2014 USD ($)	Dec. 31, 2013 Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.05 maturing in 2014 CAD	Dec. 31, 2013 Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.06 maturing in 2015 USD ($)	Dec. 31, 2013 Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.06 maturing in 2015 CAD	Dec. 31, 2013 Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.05 USD ($)	Dec. 31, 2013 Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.05 CAD
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	4	4	$ 336	358	$ 9	9	$ 345	367	$ 336	354	$ 9	9	$ 345	363
Average exchange rate for outstanding foreign currency forward exchange contracts				1.06		1.07		1.06		1.05		1.06		1.05

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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Namespace Prefix:	invest_
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Period Type:	instant

X

- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageForwardExchangeRate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ForeignCurrencyDerivativesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration