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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