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v2.4.1.9

Debt and Other Obligations Debt Securities Activity (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 3 Months Ended | 1 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2014 | Dec. 31, 2014
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities | $ 46 us-gaap_RepaymentsOfUnsecuredDebt | $ 333 us-gaap_RepaymentsOfUnsecuredDebt |  |  |  |  |  |  |  |
Redemptions/maturities of variable interest entities | 15 us-gaap_RepaymentsOfOtherLongTermDebt | 15 us-gaap_RepaymentsOfOtherLongTermDebt |  |  |  |  |  |  |  |
Total redemptions/maturities of debt | 61 us-gaap_ProceedsFromRepaymentsOfOtherDebt |  |  |  |  |  |  |  |  |
electronotes |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities |  |  | 42 us-gaap_RepaymentsOfUnsecuredDebt / tve_RedemptionsAndMaturitiesAxis = tve_ElectronotesMember | [1] | 1 us-gaap_RepaymentsOfUnsecuredDebt / tve_RedemptionsAndMaturitiesAxis = tve_ElectronotesMember | [1] |  |  |  |
Interest rate | 4.20%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_ElectronotesMember |  | 4.20%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_ElectronotesMember |  | 2.65%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_ElectronotesMember |  |  |  | 2.65%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_ElectronotesMember |
2009 Series A |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities |  |  |  |  |  |  | 2 us-gaap_RepaymentsOfUnsecuredDebt / tve_RedemptionsAndMaturitiesAxis = tve_A2009SeriesMember | [1] |  |
Interest rate |  |  |  |  |  |  | 2.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_A2009SeriesMember |  |  |
2009 Series B |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities |  |  |  |  |  |  |  |  | 1 us-gaap_RepaymentsOfUnsecuredDebt / tve_RedemptionsAndMaturitiesAxis = tve_A2009SeriesBMember | [1]
Interest rate |  |  |  |  | 3.77%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_A2009SeriesBMember |  |  |  | 3.77%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_A2009SeriesBMember |
Debt of variable interest entities |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Redemptions/maturities of variable interest entities |  |  | $ 15 us-gaap_RepaymentsOfOtherLongTermDebt / tve_RedemptionsAndMaturitiesAxis = tve_DebtOfVariableInterestEntitiesMember | [1] |  |  |  |  |  |
Interest rate of variable interest entities | 4.29%tve_OtherDebtinstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_DebtOfVariableInterestEntitiesMember |  | 4.29%tve_OtherDebtinstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_DebtOfVariableInterestEntitiesMember |  |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |
Percent of par value | 100.00%tve_PercentOfParValue / tve_RedemptionsAndMaturitiesAxis = tve_TotalMember |  | 100.00%tve_PercentOfParValue / tve_RedemptionsAndMaturitiesAxis = tve_TotalMember |  |  |  |  |  |  |
[1] | All redemptions were at 100 percent of par.

X
- Definition Effective interest rate for the funds borrowed under the other debt agreements considering interest compounding and original issue discount or premium. + References No definition available. + Details
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- Definition The percent of par value that debt was issued/redeemed for. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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Balance Type: | debit
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- Definition The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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