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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Reclassificatons (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Reclassifications
Reclassification from Other, net to Regulatory assets costs	$ (14)	$ (21)
Reclassification from Nuclear refueling outage amortization to Other, net		42
Reclassification from Proceeds from leasebacks to Other, net		$ 5

X

- Definition

Reclassification from Nuclear refueling outage amortization to Other, net in the Cash flows from operating activities section of the Consolidated Statements

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Reclassification from Proceeds from leasebacks to Other, net in the Cash flows from financing activities section of the Consolidated Statements

+ References

No definition available.

+ Details

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

X

- Details

Name:	tve_ReclassificationsLineItems
Namespace Prefix:	tve_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration