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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - General (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 Customers | Sep. 30, 2013 People
Population of Service Area |  |
Number of customers for whom unbilled revenues are estimated | 6 |
Population of TVA's service area (number of people) |  | 9,000,000
Possible amount of future payments to the Department of Energy under the blended low-enriched uranium program |  | $ 175
Estimated future payments attributable to blended low-enriched uranium fuel currently in use |  | 106
Maximum original maturity |  | 3 months
Subsequent period after a nuclear refueling outage when the benefits of the costs are realized - minimum |  | 18 months
Subsequent period after a nuclear refueling outage when the benefits of the costs are realized - maximum |  | 24 months
Recorded cost for emission allowances granted by the Environmental Protection Agency |  | 0
BLEU fuel obligation |  | $ 6

X
- Definition The liability established for payments due that are attributable to blended low-enriched uranium fuel that has been used. + References No definition available. + Details
Name: | tve_BLEUfuelobligation
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum original maturity length for cash and cash equivalents. + References No definition available. + Details
Name: | tve_MaximumOriginalMaturity
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of customers for whom unbilled revenues are estimated. + References No definition available. + Details
Name: | tve_Numberofcustomersforwhomunbilledrevenuesareestimated
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payments attributable to blended low-enriched uranium fuel program + References No definition available. + Details
Name: | tve_PaymentsattributabletoBLEUfuelprogram
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The population of the company's service area. + References No definition available. + Details
Name: | tve_PopulationOfServiceArea
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | tve_PopulationOfServiceAreaLineItems
Namespace Prefix: | tve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The possible amount of future payments. + References No definition available. + Details
Name: | tve_PossibleAmountOfFuturePayments
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Recorded cost for emission allowances granted by the Environmental Protection Agency + References No definition available. + Details
Name: | tve_RecordedCostForEmissionAllowancesGrantedByEnvironmentalProtectionAgency
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Subsequent period after a nuclear refueling outage when the benefits of the costs are realized - maximum + References No definition available. + Details
Name: | tve_SubsequentPeriodAfterNuclearRefuelingOutageWhenBenefitsOfCostsAreRealizedMaximum
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | instant

X
- Definition Subsequent period after a nuclear refueling outage when the benefits of the costs are realized - minimum + References No definition available. + Details
Name: | tve_SubsequentPeriodAfterNuclearRefuelingOutageWhenBenefitsOfCostsAreRealizedMinimum
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | instant