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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jan. 15, 2015
Subsequent Event [Line Items]
Redemptions and repurchases of power bonds	$ 4us-gaap_RepaymentsOfUnsecuredDebt	$ 7us-gaap_RepaymentsOfUnsecuredDebt
Subsequent Event [Member]
Subsequent Event [Line Items]
Redemptions and repurchases of power bonds			$ 25us-gaap_RepaymentsOfUnsecuredDebt / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Interest rate of power bonds			4.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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