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Debt and Other Obligations Debt Securities Activity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Debt Instrument
Redemptions/maturities of power bonds	$ 4us-gaap_RepaymentsOfUnsecuredDebt		$ 7us-gaap_RepaymentsOfUnsecuredDebt
Total redemptions/maturities of debt	4us-gaap_ProceedsFromRepaymentsOfOtherDebt
electronotes [Member]
Debt Instrument
Redemptions/maturities of power bonds	1us-gaap_RepaymentsOfUnsecuredDebt / tve_RedemptionsAndMaturitiesAxis = tve_ElectronotesMember
Interest rate of power bonds	2.65%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_ElectronotesMember	[1]
2009 Series A [Member]
Debt Instrument
Redemptions/maturities of power bonds	2us-gaap_RepaymentsOfUnsecuredDebt / tve_RedemptionsAndMaturitiesAxis = tve_A2009SeriesMember
Interest rate of power bonds	2.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_A2009SeriesMember	[1]
Total [Member]
Debt Instrument
Percent of par value	100.00%tve_PercentOfParValue / tve_RedemptionsAndMaturitiesAxis = tve_TotalMember
2009 Series B [Member]
Debt Instrument
Redemptions/maturities of power bonds	$ 1us-gaap_RepaymentsOfUnsecuredDebt / tve_RedemptionsAndMaturitiesAxis = tve_A2009SeriesBMember
Interest rate of power bonds	3.77%us-gaap_DebtInstrumentInterestRateEffectivePercentage / tve_RedemptionsAndMaturitiesAxis = tve_A2009SeriesBMember	[1]
[1] All redemptions were at 100 percent of par.

X

- Definition

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

+ References

No definition available.

+ Details

Name:	tve_PercentOfParValue
Namespace Prefix:	tve_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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

+ Details

Name:	us-gaap_ProceedsFromRepaymentsOfOtherDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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)

-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

Name:	us-gaap_RepaymentsOfUnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

Name:	tve_RedemptionsAndMaturitiesAxis=tve_ElectronotesMember
Namespace Prefix:
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X

- Details

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Namespace Prefix:
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