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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Currency Swaps Outstanding (Details) (GBP £) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014
Derivative |
Number of British pound sterling denominated bond transactions | 3
1999 Currency Swap Contract |
Derivative |
Effective Date of Currency Swap Contract | 1999
Associated TVA bond issues currency exposure | £ 200
Expiration Date of Swap | 2021
Overall effective cost to TVA | 5.81%
2001 Currency Swap Contract |
Derivative |
Effective Date of Currency Swap Contract | 2001
Associated TVA bond issues currency exposure | 250
Expiration Date of Swap | 2032
Overall effective cost to TVA | 6.59%
2003 Currency Swap Contract |
Derivative |
Effective Date of Currency Swap Contract | 2003
Associated TVA bond issues currency exposure | £ 150
Expiration Date of Swap | 2043
Overall effective cost to TVA | 4.96%

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References No definition available. + Details
Name: | tve_AssociatedBondIssuesCurrencyExposure
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Effective Date of Currency Swap Contract + References No definition available. + Details
Name: | tve_EffectiveDateofCurrencySwapContract
Namespace Prefix: | tve_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expiration Date of Swap + References No definition available. + Details
Name: | tve_ExpirationDateofSwap
Namespace Prefix: | tve_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of British pound streling denominated bond transactions + References No definition available. + Details
Name: | tve_NumberOfBritishPoundStrelingDenominatedBondTransactions
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration