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Impact of New Accounting Standards and Interpretations Impact of New Accounting Standards and Interpretations (Details) (Other Noncurrent Assets [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014
Other Noncurrent Assets [Member]
Unamortized debt issue cost of power bonds and variable interest entities	$ 78us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember	$ 68us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember

X

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.17)

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

+ Details

Name:	us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant