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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Reclassificatons (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Reclassifications |  |
Reclassification from Long-Term Assets to Long-Term Debt | $ 80 |
Reclassification from Other Assets to Long-term Power Bonds | 67 |
Reclassification from Other Assets to Long-Term VIE | 13 |
Reclassification from Other, net to Settlements from Asset Retirement Obligations | $ (58) | $ (14)

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- Definition Amount reclassified from Other Assets to Long Term debt + References No definition available. + Details
Name: | tve_ReclassificationfromLongTermAssetstoLongTermDebt
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Reclassification from Other Long-Term Assets to Long-term VIE for financial statement presentation purposes + References No definition available. + Details
Name: | tve_ReclassificationfromOtherAssetstoLongTermVIE
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Reclassification from Other Long-Term Assets to Long-term Power Bonds for financial statement presentation purposes + References No definition available. + Details
Name: | tve_ReclassificationfromOtherAssetstoLongtermPowerBonds
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Reclassification from Other, net to Settlements from Asset Retirement Obligations on the Cash Flow Statement (Operating Activities) + References No definition available. + Details
Name: | tve_ReclassificationfromOthernettoSettlementsfromAssetRetirementObligations
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Reclassifications [Line Items] + References No definition available. + Details
Name: | tve_ReclassificationsLineItems
Namespace Prefix: | tve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration