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Derivatives and Risk Management Activities (Details 3) In Millions, unless otherwise specified	Mar. 31, 2014 Foreign Currency Derivatives CAD	Mar. 31, 2014 Foreign exchange forward contracts maturing in 2014 CAD	Mar. 31, 2014 Foreign exchange forward contracts maturing in 2015 CAD	Mar. 31, 2014 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.11 maturing in 2014 USD ($)	Mar. 31, 2014 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.11 maturing in 2014 CAD	Mar. 31, 2014 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.11 maturing in 2015 USD ($)	Mar. 31, 2014 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.11 maturing in 2015 CAD	Mar. 31, 2014 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.11 USD ($)	Mar. 31, 2014 Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.11 CAD	Mar. 31, 2014 Foreign exchange forward contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.10 maturing in 2014 USD ($)	Mar. 31, 2014 Foreign exchange forward contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.10 maturing in 2014 CAD	Mar. 31, 2014 Foreign exchange forward contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.06 maturing in 2015 USD ($)	Mar. 31, 2014 Foreign exchange forward contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.06 maturing in 2015 CAD	Mar. 31, 2014 Foreign exchange forward contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.10 USD ($)	Mar. 31, 2014 Foreign exchange forward contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.10 CAD
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	3	2	1	$ 265	293	$ 9	10	$ 274	303	$ 265	291	$ 9	9	$ 274	300
Average exchange rate for outstanding foreign currency forward exchange contracts					1.11		1.11		1.11		1.10		1.06		1.10

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

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