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Debt and Other Obligations Lease/Leaseback Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2003 Units	Mar. 31, 2015	Sep. 30, 2014
Debt Disclosure [Abstract]
Proceeds prior to 2004	$ 945tve_ProceedsPriorTo2004
Leaseback transaction, number of units	24tve_LeasebackTransactionNumberOfUnits
Proceeds in 2003	389tve_ProceedsIn2003
CT and QTE outstanding leaseback obligation		$ 637tve_CtAndQteOutstandingLeasebackObligation	$ 691tve_CtAndQteOutstandingLeasebackObligation

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

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

- Details

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