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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets and Liabilities (Details) (USD $)
Dec. 31, 2014
Sep. 30, 2014
Offsetting Assets [Line Items]    
Securities Borrowed, Amount Offset Against Collateral $ 15,000,000us-gaap_SecuritiesBorrowedAmountOffsetAgainstCollateral  
Gross Amounts of Recognized Assets 135,000,000us-gaap_DerivativeFairValueOfDerivativeAsset 115,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amounts Offset in the Balance Sheet (115,000,000)us-gaap_DerivativeAssetFairValueGrossLiability [1] (115,000,000)us-gaap_DerivativeAssetFairValueGrossLiability [1]
Net Amounts of Assets Presented in the Balance Sheet 20,000,000us-gaap_DerivativeAssets [2] 1,000,000us-gaap_DerivativeAssets [2]
Total derivatives not subject to master netting or similar arrangement 0us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement [2] 1,000,000us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement [2]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 135,000,000us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement 116,000,000us-gaap_DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 1,791,000,000us-gaap_DerivativeFairValueOfDerivativeLiability 1,517,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
Gross Amounts Offset in the Balance Sheet (187,000,000)us-gaap_DerivativeLiabilityFairValueGrossAsset [1] (120,000,000)us-gaap_DerivativeLiabilityFairValueGrossAsset [1]
Net Amounts of Liabilities Presented in the Balance Sheet 1,737,000,000us-gaap_DerivativeLiabilities [2] 1,494,000,000us-gaap_DerivativeLiabilities [2]
Total derivatives not subject to master netting or similar arrangement 133,000,000us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement [2] 97,000,000us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement [2]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 1,924,000,000us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement 1,614,000,000us-gaap_DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement
Letter of Credit    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding 1,000,000,000us-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 58,000,000us-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 (38,000,000)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 20,000,000us-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 23,000,000us-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 23,000,000us-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 1,532,000,000us-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 1,532,000,000us-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 77,000,000us-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 (77,000,000)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 236,000,000us-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 (187,000,000)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 49,000,000us-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 20,000,000us-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 $ 1,604,000,000us-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 balance sheets.
[3] Securities of approximately $15 million were posted to TVA by a counterparty to partially secure the asset positions of two of the currency swaps in accordance with the collateral requirements for these derivatives.
[4] Letters of credit of approximately $1.0 billion were posted as collateral at December 31, 2014 and September 30, 2014, 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.