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Summary of Significant Accounting Policies Reclassificatons (Details) (USD $)	3 Months Ended	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Reclassifications
Accounts payable and accrued liabilities		$ 75,000,000
Inventories and other, net		(24,000,000)
Municipalities and cooperatives	2,300,000,000	7,200,000,000
Industries directly served	310,000,000	1,100,000,000
Federal agencies and other	31,000,000	95,000,000
Sales of electricity	$ 2,600,000,000	$ 8,400,000,000

X

- Definition

The amount of the increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid that was reclassed.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of the increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities that was reclassed.

+ References

No definition available.

+ Details

Name:	tve_IncreaseDecreaseInInventoriesReclass
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	tve_ReclassificationsLineItems
Namespace Prefix:	tve_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revenue derived from the sale of electricity to federal agencies and other entities not included in municipalities and cooperatives or industries directly served, including exchange power arrangements with other electric systems.

+ References

No definition available.

+ Details

Name:	tve_SalesOfElectricityFederal
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Revenue derived from the sale of electricity to directly served industrial customers. Directly served customers are defined as having large or unusual electricity demand requirements.

+ References

No definition available.

+ Details

Name:	tve_SalesOfElectricityIndustriesDirectlyServed
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Revenue derived from the sale of electricity to municipalities and cooperative customers at wholesale rates. These customers then resell the power to their customers at retail rates.

+ References

No definition available.

+ Details

Name:	tve_SalesOfElectricityMunicipalitiesAndCooperatives
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Reclassification of the aggregate revenue, whether regulated or unregulated, derived from the generation, transmission and distribution of electricity.

+ References

No definition available.

+ Details

Name:	tve_SalesOfElectricityReclassification
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration