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Variable Interest Entities Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Sep. 30, 2014	Aug. 09, 2013	Jan. 17, 2012
VIE Financing
Membership interests of VIE subject to mandatory redemption	$ 50us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount	$ 50us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount	$ 40us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount
Total liabilities of VIE	1,345us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities	1,362us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities		1,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
SCCG
VIE Financing
Face amount			360us-gaap_DebtInstrumentFaceAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = tve_SCCGMember
JSCCG
VIE Financing
Face amount				900us-gaap_DebtInstrumentFaceAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = tve_JsccgMember
Holdco
VIE Financing
Face amount				100us-gaap_DebtInstrumentFaceAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = tve_HoldcoMember
Accrued interest of VIE
VIE Financing
Total liabilities of VIE	11us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_InterestPayableCurrentMember	12us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_InterestPayableCurrentMember
Current portion of membership interests of VIE subject to mandatory redemption
VIE Financing
Total liabilities of VIE	2us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember	2us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Current maturities of long-term debt of VIE
VIE Financing
Total liabilities of VIE	33us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_OtherLongtermDebtCurrentMember	32us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_OtherLongtermDebtCurrentMember
Total current liabilities of VIE
VIE Financing
Total liabilities of VIE	46us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_LiabilitiesCurrentMember	46us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_LiabilitiesCurrentMember
Membership interests of VIE subject to mandatory redemption
VIE Financing
Total liabilities of VIE	36us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	37us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Long-term debt of VIE
VIE Financing
Total liabilities of VIE	$ 1,263us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_OtherLongtermDebtNoncurrentMember	$ 1,279us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_OtherLongtermDebtNoncurrentMember

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Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 480

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The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

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