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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