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Other Long-Term Liabilities (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Mar. 31, 2015	Sep. 30, 2014	Aug. 09, 2013
Other Long-Term Liabilities
Interest rate swap liabilities	1,697us-gaap_InterestRateDerivativeLiabilitiesAtFairValue	$ 1,348us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
EnergyRight® financing obligation	213us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	215us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount
Currency swap liabilities	52us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure	15us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Total other long-term liabilities	2,347us-gaap_OtherLiabilitiesNoncurrent	1,962us-gaap_OtherLiabilitiesNoncurrent
Percentage of membership interests issued			100.00%tve_Percentageofmembershipinterestsissued
Membership interests of VIE subject to mandatory redemption, interest rate, stated percentage			7.00%tve_Financialinstrumentssubjecttomandatoryredemptioninterestratestatedpercentage
Membership interests of VIE subject to mandatory redemption	50us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount	50us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount	40us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount
SCCG balloon payment			4tve_SCCGballoonpayment
Energy Right Program
Other Long-Term Liabilities
Number of days in default	180 days
Other Noncurrent Liabilities [Member]
Other Long-Term Liabilities
Interest rate swap liabilities	1,697us-gaap_InterestRateDerivativeLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	1,348us-gaap_InterestRateDerivativeLiabilitiesAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Environmental agreements liability	79tve_EnvironmentalAgreementsLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	108tve_EnvironmentalAgreementsLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
EnergyRight® financing obligation	151us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	152us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Membership interests of VIE subject to mandatory redemption	36us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	37us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Commodity contract derivative liabilities	41tve_CommodityContractLiabilityNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	17tve_CommodityContractLiabilityNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Commodity swap derivative liabilities	14us-gaap_HedgingLiabilitiesNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	14us-gaap_HedgingLiabilitiesNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Currency swap liabilities	52us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	15us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Other	277us-gaap_OtherSundryLiabilitiesNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	271us-gaap_OtherSundryLiabilitiesNoncurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Accounts Payable and Accrued Liabilities [Member]
Other Long-Term Liabilities
EnergyRight® financing obligation	38us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember	38us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Current portion of membership interests of VIE subject to mandatory redemption	2us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember	$ 2us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember

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- Definition

Carrying amount as of the balance sheet date of the liability arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.

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- Definition

The liability related to the Environmental Agreements.

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- Definition

Contractual interest rate for funds borrowed, under the agreement.

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The number of days in default that are determined to be uncollectible.

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- Definition

The percentage of membership interest issued from one entity to another.

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No definition available.

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- Definition

The balloon payment amount due at maturity on the SCCG membership interests

+ References

No definition available.

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- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

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- Definition

Fair value of liability arising from a financial instrument or contract used to mitigate a specified risk (hedge), expected to be settled after one year or beyond the normal operating cycle, if longer.

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- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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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.

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The amount that is required to be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has exercised the right to or the shares are mandatorily redeemable within one year of the reporting date or operating cycle, if longer.

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The amount that is required to be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has exercised the right to or the shares are mandatorily redeemable after one year from the reporting date or operating cycle, if longer.

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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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