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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - General (Details) People in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2016 USD ($) People Customers
Population of Service Area |
Population of TVA's service area (number of people) | People | 9
Maximum original maturity | 3 months
Number of customers for whom unbilled revenues are estimated | Customers | 6
Revenue Capitalized During Pre-Commercial Operations | $ 18
Fuel Cost Capitalized During Pre-Commercial Operations | 6
Recorded cost for emission allowances granted by the Environmental Protection Agency | 0
Possible amount of future payments to the Department of Energy under the blended low-enriched uranium program | 165
Payments attributable to blended low-enriched uranium fuel currently in use | 151
BLEU fuel obligation | $ 5

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 Fuel costs incurred during pre-commercial generation capitalized to project costs. + References No definition available. + Details
Name: | tve_FuelCostCapitalizedDuringPreCommercialOperations
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum original maturity + References No definition available. + Details
Name: | tve_Maximumoriginalmaturity
Namespace Prefix: | tve_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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
- Definition Population of Service Area [Line Items] + References No definition available. + Details
Name: | tve_PopulationOfServiceAreaLineItems
Namespace Prefix: | tve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 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 + References No definition available. + Details
Name: | tve_RevenueCapitalizedDuringPreCommercialOperations
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | tve_TotalpossibleamountofBLEUpayments
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant