XML 83 R41.htm IDEA: XBRL DOCUMENT v2.4.0.8

Summary of Significant Accounting Policies Reclassificatons (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
Accounting Policies [Abstract]
Reclassification from Other, net to Regulatory assets costs	$ (5)

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

- Details

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