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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Reclassificatons (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Reclassifications
Reclassification from Environmental cleanup costs-Kingston ash spill to Insurance recoveries	$ 47	$ 5

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- Definition

Reclassification from Environmental cleanup costs-Kingston ash spill to Insurance recoveries in the Cash flows from operating activities of the Consolidated Statements of Cash Flows

+ References

No definition available.

+ Details

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- Details

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