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Fair Value Measurements Fair Value Measurements - Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Aug. 09, 2013
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight receivables (including current portion)	$ 166	$ 150
Loans and other long-term receivables, net (including current portion)	81	67
EnergyRight purchase obligation (including current portion)	215	222
Unfunded Loan Commitments	18	13
Membership interests of VIE subject to mandatory redemption (including current portion)	50	50	40
Long-term outstanding power bonds (including current maturities), net	26,889	24,603
Long-term debt of variable interest entities (including current maturities)	1,425	1,386
Portion at Other than Fair Value Measurement [Member]
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight receivables (including current portion)	156	150
Loans and other long-term receivables, net (including current portion)	92	73
EnergyRight purchase obligation (including current portion)	190	186
Unfunded Loan Commitments	0	0
Membership interests of VIE subject to mandatory redemption (including current portion)	39	40
Long-term outstanding power bonds (including current maturities), net	22,980	22,347
Long-term debt of variable interest entities (including current maturities)	$ 1,300	$ 1,300

X

- Definition

An unfunded loan commitment is typically a letter from a lending institution to a borrower detailing out the germane terms of a loan that the lender is binding itself to (amount, rate, term, collateral, etc). It is a binding contract on the part of the lender if the borrower accepts the terms of the commitment. They usually are only binding for a short period of time.

+ References

No definition available.

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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)

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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

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Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

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Carrying amount of financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

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Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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