XML 43 R40.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Summary of Significant Accounting Policies Reclassificatons (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Reclassifications |  |
Reclassification from Other, net to Inventory and other, net | $ 67 |
Reclassification from margin cash collateral, net to inventory and other, net |  | $ (323)

X
- Definition Reclassification from Margin cash collateral, net to Inventory and other, net on the Consolidated Statements of Cash Flows + References No definition available. + Details
Name: | tve_ReclassificationFromMarginCashCollateralNetToInventoryAndOtherNet
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reclassification from Other, net to Inventory and other, net on the Consolidated Statements of Cash Flows + References No definition available. + Details
Name: | tve_ReclassificationFromOtherNetToInventoryAndOtherNet
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | tve_ReclassificationsLineItems
Namespace Prefix: | tve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration