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Summary of Significant Accounting Policies Reclassificatons (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 30, 2013
Accounting Policies [Abstract]
Reclassification from Other, net to Regulatory assets costs and Pension contributions	$ (14)
Reclassification to Regulatory Assets from Other, net	(8)
Reclassification to Pension contributions from Other, net	(6)
Reclassification from Environmental cleanup costs-Kingston ash spill to Insurance recoveries	5
Reclassification to Insurance recoveries from Environmental cleanup costs-Kingston ash spill	$ 5

X

- Definition

Reclassification from Environmental cleanup costs-Kingston ash spill to Insurance recoveries in the Cash flows from operating activities of the Consolidated Statements of Cash Flows

+ References

No definition available.

+ Details

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

X

- Definition

Reclassification from Other, net to Regulatory assets and Pension contributions costs in the Cash flows from operating activities section of the Consolidated Statements of Cash Flows

+ References

No definition available.

+ Details

Name:	tve_ReclassificationfromOthernettoRegulatoryassetsandPensioncontributionscosts
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Reclassification to Insurance recoveries from Environmental cleanup costs-Kingston ash spill

+ References

No definition available.

+ Details

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

X

- Definition

Reclassification to Pension contributions from Other, net costs in the Cash flows from operating activities section of the Consolidated Statements of Cash Flows

+ References

No definition available.

+ Details

Name:	tve_ReclassificationtoPensioncontributionsfromOthernet
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Reclassification to Regulatory assets from Other, net costs in the Cash flows from operating activities section of the Consolidated Statements of Cash Flows

+ References

No definition available.

+ Details

Name:	tve_ReclassificationtoRegulatoryAssetsfromOthernet
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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