XML 78 R56.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Reclassificatons (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Reclassifications |  |
Reclassification from Environmental cleanup costs-Kingston ash spill-non cash to Other, net | $ 68 | $ 72
Reclassification from Environmental cleanup costs-Kingston ash spill to Other, net | $ (109) | $ (99)

X
- Definition Reclassification from Environmental cleanup costs-Kingston ash spill-non cash to Other, net on the Consolidated Statements of Cash Flows + References No definition available. + Details
Name: | tve_ReclassificationfromEnvironmentalcleanupcostsKingstonashspillnoncashtoOthernet
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reclassification from Environmental cleanup costs-Kingston ash spill to Other, net on the Consolidated Statements of Cash Flows + References No definition available. + Details
Name: | tve_ReclassificationfromEnvironmentalcleanupcostsKingstonashspilltoOthernet
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reclassifications [Line Items] + References No definition available. + Details
Name: | tve_ReclassificationsLineItems
Namespace Prefix: | tve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration