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Risk Management Activities and Derivative Transactions Currency Swaps Outstanding (Details) (GBP £) In Millions, unless otherwise specified | 6 Months Ended
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Mar. 31, 2015
1999 Currency Swap Contract |
Derivative |
Effective Date of Currency Swap Contract | 1999
Associated TVA bond issues currency exposure | £ 200 tve_AssociatedBondIssuesCurrencyExposure / us-gaap_DerivativeByNatureAxis = tve_A1999CurrencySwapContractMember
Expiration Date of Swap | 2021
Overall effective cost to TVA | 5.81%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = tve_A1999CurrencySwapContractMember
2001 Currency Swap Contract |
Derivative |
Effective Date of Currency Swap Contract | 2001
Associated TVA bond issues currency exposure | 250 tve_AssociatedBondIssuesCurrencyExposure / us-gaap_DerivativeByNatureAxis = tve_A2001CurrencySwapContractMember
Expiration Date of Swap | 2032
Overall effective cost to TVA | 6.59%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = tve_A2001CurrencySwapContractMember
2003 Currency Swap Contract |
Derivative |
Effective Date of Currency Swap Contract | 2003
Associated TVA bond issues currency exposure | £ 150 tve_AssociatedBondIssuesCurrencyExposure / us-gaap_DerivativeByNatureAxis = tve_A2003CurrencySwapContractMember
Expiration Date of Swap | 2043
Overall effective cost to TVA | 4.96%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = tve_A2003CurrencySwapContractMember

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- 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

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- 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

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- 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

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

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeByNatureAxis=tve_A2001CurrencySwapContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeByNatureAxis=tve_A2003CurrencySwapContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |