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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
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Sep. 30, 2014 Customers 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 | $ 160
Estimated future payments attributable to blended low-enriched uranium fuel currently in use | 101
Maximum original maturity | 3 months
Recorded cost for emission allowances granted by the Environmental Protection Agency | 0
BLEU fuel obligation | $ 16

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 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
- 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 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