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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Estimated Values of Financial Intruments Not Recorded at Fair Value
Loans and other long-term receivables, net	$ 200	$ 74
Long-term outstanding power bonds (including current maturities), net	21,584	23,949
Long-term debt of variable interest entities (including current maturities)	1,000	0
Fair Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
Loans and other long-term receivables, net	195	68
Long-term outstanding power bonds (including current maturities), net	27,078	29,190
Long-term debt of variable interest entities (including current maturities)	$ 1,124	$ 0

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle) and amount due to the Entity from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such investments and receivables to an amount that approximates their net realizable value.

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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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