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Fair Value Measurements Estimated Values of Financial Instruments Not Recorded at Fair Value (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014	Aug. 09, 2013
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight receivables	$ 165us-gaap_TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount	$ 166us-gaap_TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount
Long-term Investments and Receivables, Net	110us-gaap_NotesReceivableNet	81us-gaap_NotesReceivableNet
EnergyRight® financing obligation	213us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	215us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount
Unfunded Loan Commitments	0tve_UnfundedLoanCommitments	18tve_UnfundedLoanCommitments
Membership interest of variable interest entity subject to mandatory redemption (including current portion)	50us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount	50us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount	40us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount
Long-term outstanding power bonds (including current maturities), net	27,697us-gaap_UnsecuredDebt	26,889us-gaap_UnsecuredDebt
Long-term debt of variable interest entities (including current maturities)	1,490us-gaap_OtherLongTermDebt	1,425us-gaap_OtherLongTermDebt
Carrying Value
Estimated Values of Financial Intruments Not Recorded at Fair Value
EnergyRight receivables	157us-gaap_TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember	156us-gaap_TransfersAccountedForAsSecuredBorrowingsAssetsCarryingAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Long-term Investments and Receivables, Net	121us-gaap_NotesReceivableNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember	92us-gaap_NotesReceivableNet / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
EnergyRight® financing obligation	189us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember	190us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Unfunded Loan Commitments	0tve_UnfundedLoanCommitments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember	0tve_UnfundedLoanCommitments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Membership interest of variable interest entity subject to mandatory redemption (including current portion)	38us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember	39us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Long-term outstanding power bonds (including current maturities), net	22,854us-gaap_UnsecuredDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember	22,980us-gaap_UnsecuredDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Long-term debt of variable interest entities (including current maturities)	$ 1,296us-gaap_OtherLongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember	$ 1,311us-gaap_OtherLongTermDebt / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember

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

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Subparagraph (SX 210.5-02.3)

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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

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- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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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.

+ References

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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).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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