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Leaseback Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2003 Units	Mar. 31, 2013	Sep. 30, 2012
Leaseback Obligations
Proceeds prior to 2004	$ 945
Number of new peaking combustion turbine units	24
Proceeds in 2003	389
CT and QTE outstanding leaseback obligation		780	825
SSSL undivided interest		90.00%
Southaven leaseback obligation		$ 370	$ 378

X

- Definition

The outstanding leaseback obligations related to combustion turbine units and qualified technological equipment and software.

+ References

No definition available.

+ Details

Name:	tve_CtAndQteOutstandingLeasebackObligation
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The number of units involved in leaseback transactions.

+ References

No definition available.

+ Details

Name:	tve_LeasebackTransactionNumberOfUnits
Namespace Prefix:	tve_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The outstanding leaseback obligations.

+ References

No definition available.

+ Details

Name:	tve_OutstandingSouthavenLeasebackObligation
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Proceeds received from entering into a leaseback transaction for qualified technological equipment and software in 2003.

+ References

No definition available.

+ Details

Name:	tve_ProceedsIn2003
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Proceeds received prior to 2004 by entering into leaseback transactions for 24 new peaking combustion turbine units.

+ References

No definition available.

+ Details

Name:	tve_ProceedsPriorTo2004
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

SSSL's ownership interest in the combined cycle combustion turbine facility in Southhaven, Mississippi.

+ References

No definition available.

+ Details

Name:	tve_SsslsOwnershipInterest
Namespace Prefix:	tve_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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