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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	$ 46us-gaap_RepaymentsOfUnsecuredDebt	$ 333us-gaap_RepaymentsOfUnsecuredDebt
Redemptions/maturities of variable interest entities	15us-gaap_RepaymentsOfOtherLongTermDebt	15us-gaap_RepaymentsOfOtherLongTermDebt
Total redemptions/maturities of debt	61us-gaap_ProceedsFromRepaymentsOfOtherDebt
electronotes
Debt Instrument
Redemptions/maturities			42us-gaap_RepaymentsOfUnsecuredDebt / tve_RedemptionsAndMaturitiesAxis = tve_ElectronotesMember	[1]	1us-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							2us-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									1us-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			$ 15us-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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Namespace Prefix:	tve_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The percent of par value that debt was issued/redeemed for.

+ References

No definition available.

+ Details

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Namespace Prefix:	tve_
Data Type:	num:percentItemType
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X

- 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

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Period Type:	duration

X

- 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

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X

- 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



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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- 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)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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