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

Fuel costs incurred during pre-commercial generation capitalized to project costs.

No definition available.

Name:	tve_FuelCostCapitalizedDuringPreCommercialOperations
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

Maximum original maturity

No definition available.

Name:	tve_Maximumoriginalmaturity
Namespace Prefix:	tve_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

The number of customers for whom unbilled revenues are estimated.

No definition available.

Name:	tve_Numberofcustomersforwhomunbilledrevenuesareestimated
Namespace Prefix:	tve_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Payments attributable to blended low-enriched uranium fuel program

No definition available.

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

The population of the company's service area.

No definition available.

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

Population of Service Area [Line Items]

No definition available.

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

Recorded cost for emission allowances granted by the Environmental Protection Agency

No definition available.

Name:	tve_RecordedCostForEmissionAllowancesGrantedByEnvironmentalProtectionAgency
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Estimates of revenue realized from pre-commercial generation based on the guidance provided by FERC regulations. The calculated revenue is capitalized to offset project costs and is included in revenue as a contra-revenue amount

No definition available.

Name:	tve_RevenueCapitalizedDuringPreCommercialOperations
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

Revenue reduction for energy prepayment

No definition available.

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

Total of past and projected future payments that TVA may make to the DOE over the duration of the BLEU fuel program, from inception to termination. It includes the amounts paid out, plus an estimated amount related to possible future payments that may be payable to the DOE until the time that the BLEU fuel program ceases to be in effect.

No definition available.

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

A valuation allowance relating to a written agreement to receive money (at a specified future date(s) more than one year from the reporting date, consisting of principal as well as any accrued interest) for the portion that is expected to be uncollectible.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_AllowanceForNotesAndLoansReceivableNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

No definition available.

Name:	us-gaap_DeferredRevenueRevenueRecognized1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682