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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
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VIE Financing |  |  |  |
Membership interests of VIE subject to mandatory redemption | $ 50 us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount | $ 50 us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount | $ 40 us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmount |
Total liabilities of VIE | 1,345 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities | 1,362 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities |  | 1,000 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
SCCG |  |  |  |
VIE Financing |  |  |  |
Face amount |  |  | 360 us-gaap_DebtInstrumentFaceAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = tve_SCCGMember |
JSCCG |  |  |  |
VIE Financing |  |  |  |
Face amount |  |  |  | 900 us-gaap_DebtInstrumentFaceAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = tve_JsccgMember
Holdco |  |  |  |
VIE Financing |  |  |  |
Face amount |  |  |  | 100 us-gaap_DebtInstrumentFaceAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = tve_HoldcoMember
Accrued interest of VIE |  |  |  |
VIE Financing |  |  |  |
Total liabilities of VIE | 11 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_InterestPayableCurrentMember | 12 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_InterestPayableCurrentMember |  |
Current portion of membership interests of VIE subject to mandatory redemption |  |  |  |
VIE Financing |  |  |  |
Total liabilities of VIE | 2 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember | 2 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember |  |
Current maturities of long-term debt of VIE |  |  |  |
VIE Financing |  |  |  |
Total liabilities of VIE | 33 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_OtherLongtermDebtCurrentMember | 32 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_OtherLongtermDebtCurrentMember |  |
Total current liabilities of VIE |  |  |  |
VIE Financing |  |  |  |
Total liabilities of VIE | 46 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_LiabilitiesCurrentMember | 46 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_LiabilitiesCurrentMember |  |
Membership interests of VIE subject to mandatory redemption |  |  |  |
VIE Financing |  |  |  |
Total liabilities of VIE | 36 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember | 37 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember |  |
Long-term debt of VIE |  |  |  |
VIE Financing |  |  |  |
Total liabilities of VIE | $ 1,263 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_OtherLongtermDebtNoncurrentMember | $ 1,279 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_BalanceSheetLocationAxis = tve_OtherLongtermDebtNoncurrentMember |  |

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- Definition 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 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879 + Details
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- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685 + Details
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