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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, 2013	Sep. 30, 2012
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight receivables	$ 149	$ 150
Long-term Investments and Receivables, Net	84	76
EnergyRight purchase obligaiton	184	185
Long-term power bonds (including current maturities), net	22,186	22,577
Long-term debt of variable interest entities (including current maturities), net	988	994
Fair Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight receivables	149	150
Long-term Investments and Receivables, Net	78	70
EnergyRight purchase obligaiton	208	209
Long-term power bonds (including current maturities), net	24,514	28,041
Long-term debt of variable interest entities (including current maturities), net	$ 1,033	$ 1,116

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- Definition

Long-term debt of variable interest entities including current maturities

+ References

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- Definition

A purchase obligation including current and non-current portions.

+ References

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- Definition

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.

+ 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 210.5-02.12)

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

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.22)

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



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

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-Number 210

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-Paragraph 19, 20, 22

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Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.8)

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