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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets and Liabilities (Details) (USD $)
Mar. 31, 2015
Sep. 30, 2014
Offsetting Assets [Line Items]    
Securities Posted by Counterparty on TVA's behalf $ 14,000,000us-gaap_SecuritiesBorrowedAmountOffsetAgainstCollateral  
Gross Amounts of Recognized Assets 99,000,000us-gaap_DerivativeFairValueOfDerivativeAsset 115,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amounts Offset in the Balance Sheet (75,000,000)us-gaap_DerivativeAssetFairValueGrossLiability [1] (115,000,000)us-gaap_DerivativeAssetFairValueGrossLiability [1]
Net Amounts of Assets Presented in the Balance Sheet 29,000,000us-gaap_DerivativeAssets [2] 1,000,000us-gaap_DerivativeAssets [2]
Total derivatives not subject to master netting or similar arrangement 5,000,000us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement [2] 1,000,000us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement [2]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 104,000,000us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement 116,000,000us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 1,979,000,000us-gaap_DerivativeFairValueOfDerivativeLiability 1,517,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
Gross Amounts Offset in the Balance Sheet (184,000,000)us-gaap_DerivativeLiabilityFairValueGrossAsset [1] (120,000,000)us-gaap_DerivativeLiabilityFairValueGrossAsset [1]
Net Amounts of Liabilities Presented in the Balance Sheet 1,949,000,000us-gaap_DerivativeLiabilities [2] 1,494,000,000us-gaap_DerivativeLiabilities [2]
Total derivatives not subject to master netting or similar arrangement 154,000,000us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement [2] 97,000,000us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement [2]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 2,133,000,000us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement 1,614,000,000us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
Cash Collateral in Excess of Collateral Requirements 17,000,000us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash 19,000,000us-gaap_SecuritiesBorrowedCollateralObligationToReturnCash
Letter of Credit    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding 1,200,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember		 1,000,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
Currency Swap [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 27,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 64,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember
Gross Amounts Offset in the Balance Sheet (3,000,000)us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1] (64,000,000)us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1]
Net Amounts of Assets Presented in the Balance Sheet 24,000,000us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [2],[3] 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [2]
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 52,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [4] 15,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [4]
Gross Amounts Offset in the Balance Sheet 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1],[4] 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [1],[4]
Net Amounts of Liabilities Presented in the Balance Sheet 52,000,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [2],[4] 15,000,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember		 [2],[4]
Interest Rate Contract [Member]    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 1,697,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [4] 1,348,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [4]
Gross Amounts Offset in the Balance Sheet 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1],[4] 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1],[4]
Net Amounts of Liabilities Presented in the Balance Sheet 1,697,000,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [2],[4] 1,348,000,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [2],[4]
Commodity derivatives under FTP    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 72,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 51,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
Gross Amounts Offset in the Balance Sheet (72,000,000)us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 [1] (51,000,000)us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 [1]
Net Amounts of Assets Presented in the Balance Sheet 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 [2] 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 [2]
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 230,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 154,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember
Gross Amounts Offset in the Balance Sheet (184,000,000)us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 [1] (120,000,000)us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 [1]
Net Amounts of Liabilities Presented in the Balance Sheet 46,000,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 [2] 34,000,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_OtherContractMember		 [2]
Total derivatives subject to master netting or similar arrangement [Member]    
Offsetting Assets [Line Items]    
Net Amounts of Assets Presented in the Balance Sheet 24,000,000us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= tve_TotalderivativessubjecttomasternettingorsimilararrangementMember		 [2] 0us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= tve_TotalderivativessubjecttomasternettingorsimilararrangementMember		 [2]
Offsetting Liabilities [Line Items]    
Net Amounts of Liabilities Presented in the Balance Sheet $ 1,795,000,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= tve_TotalderivativessubjecttomasternettingorsimilararrangementMember		 [2] $ 1,397,000,000us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= tve_TotalderivativessubjecttomasternettingorsimilararrangementMember		 [2]
[1] Amounts primarily include counterparty netting of derivative contracts, margin account deposits for futures commission merchants transactions, and cash collateral received or paid in accordance with the accounting guidance for derivatives and hedging transactions.
[2] There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the Consolidated Balance Sheets.
[3] At March 31, 2015, securities of approximately $14 million were posted by a counterparty on TVA's behalf to partially secure the asset position of one of the currency swaps in accordance with the collateral requirements for these derivatives.
[4] Letters of credit of approximately $1.2 billion and $1.0 billion were posted as collateral at March 31, 2015 and September 30, 2014, respectively, to partially secure the liability positions of one of the currency swaps and one of the interest rate swaps in accordance with the collateral requirements for these derivatives. At March 31, 2015 and September 30, 2014, TVA also held $17 million and $19 million, respectively, of cash collateral in excess of collateral requirements, that was classified in Restricted cash and investments with a corresponding obligation recorded in Accounts payable and accrued liabilities in the same amount.