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Derivatives and Risk Management Activities (Details 3) In Millions, unless otherwise specified	Sep. 30, 2014 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.12 maturing in 2014 USD ($)	Sep. 30, 2014 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.12 maturing in 2014 CAD	Sep. 30, 2014 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.12 maturing in 2015 USD ($)	Sep. 30, 2014 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.12 maturing in 2015 CAD	Sep. 30, 2014 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.12 USD ($)	Sep. 30, 2014 Forward exchange contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.12 CAD	Sep. 30, 2014 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.10 maturing in 2014 USD ($)	Sep. 30, 2014 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.10 maturing in 2014 CAD	Sep. 30, 2014 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.09 maturing in 2015 USD ($)	Sep. 30, 2014 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.09 maturing in 2015 CAD	Sep. 30, 2014 Forward exchange contracts that exchange USD for CAD at the rate USD 1.00 to CAD 1.10 USD ($)	Sep. 30, 2014 Forward exchange 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	$ 284	319	$ 178	200	$ 462	519	$ 284	313	$ 178	195	$ 462	508
Average exchange rate		1.12		1.12		1.12		1.10		1.09		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_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
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