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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
	Sep. 30, 2013
Defined Benefit Plan Disclosure
Prior service cost (credit)	$ (27)
Net actuarial loss	289
Pension Benefits
Defined Benefit Plan Disclosure
Prior service cost (credit)	(21)
Net actuarial loss	278
Other Post-retirement Benefits
Defined Benefit Plan Disclosure
Prior service cost (credit)	(6)
Net actuarial loss	$ 11

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

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Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- Details

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