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Benefit Plans Expected Amortization of Regulatory Assets in Next Fiscal Year (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014
Defined Benefit Plan Disclosure |
Prior service cost (credit) | $ (27)
Net actuarial loss | 285
Pension Benefits |
Defined Benefit Plan Disclosure |
Prior service cost (credit) | (21)
Net actuarial loss | 277
Other Post-retirement Benefits |
Defined Benefit Plan Disclosure |
Prior service cost (credit) | (6)
Net actuarial loss | $ 8

X
- Definition The amounts in regulatory assets related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. + References No definition available. + Details
Name: | tve_DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfNetGainsLosses
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amounts in regulatory assets related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. + References No definition available. + Details
Name: | tve_DefinedBenefitPlanAmortizationFromRegulatoryAssetsOfNetPriorServiceCostCredit
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration