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CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Current assets    
Cash and cash equivalents $ 502us-gaap_CashAndCashEquivalentsAtCarryingValue $ 500us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash and investments 17us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 19us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 1,432us-gaap_AccountsReceivableNetCurrent 1,676us-gaap_AccountsReceivableNetCurrent
Inventories, net 1,135us-gaap_InventoryNet 1,056us-gaap_InventoryNet
Regulatory assets 629us-gaap_RegulatoryAssetsCurrent 481us-gaap_RegulatoryAssetsCurrent
Other current assets 77us-gaap_OtherAssetsCurrent 56us-gaap_OtherAssetsCurrent
Total current assets 3,792us-gaap_AssetsCurrent 3,788us-gaap_AssetsCurrent
Property, plant, and equipment    
Completed plant 48,229us-gaap_PropertyPlantAndEquipmentGross 47,564us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (25,278)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (24,589)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net completed plant 22,951tve_NetCompletedPlant 22,975tve_NetCompletedPlant
Construction in progress 6,518us-gaap_ConstructionInProgressGross 5,951us-gaap_ConstructionInProgressGross
Nuclear fuel 1,365us-gaap_NuclearFuelNetOfAmortization 1,322us-gaap_NuclearFuelNetOfAmortization
Capital leases 98us-gaap_CapitalLeasedAssetsGross 102us-gaap_CapitalLeasedAssetsGross
Total property, plant, and equipment, net 30,932us-gaap_PropertyPlantAndEquipmentNet 30,350us-gaap_PropertyPlantAndEquipmentNet
Investment funds 2,071us-gaap_LongTermInvestments 1,981us-gaap_LongTermInvestments
Regulatory and other long-term assets    
Regulatory assets 9,113us-gaap_RegulatoryAssetsNoncurrent 8,994us-gaap_RegulatoryAssetsNoncurrent
Other long-term assets 486us-gaap_OtherAssetsNoncurrent 483us-gaap_OtherAssetsNoncurrent
Total regulatory and other long-term assets 9,599us-gaap_RegulatedEntityOtherAssetsNoncurrent 9,477us-gaap_RegulatedEntityOtherAssetsNoncurrent
Total assets 46,394us-gaap_Assets 45,596us-gaap_Assets
Current liabilities    
Accounts payable and accrued liabilities 1,804us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 2,050us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Accrued interest 396us-gaap_InterestPayableCurrent 380us-gaap_InterestPayableCurrent
Current portion of leaseback obligations 78us-gaap_CapitalLeaseObligationsCurrent 75us-gaap_CapitalLeaseObligationsCurrent
Current portion of energy prepayment obligations 100us-gaap_DeferredRevenueCurrent 100us-gaap_DeferredRevenueCurrent
Regulatory liabilities 174us-gaap_RegulatoryLiabilityCurrent 184us-gaap_RegulatoryLiabilityCurrent
Short-term debt, net 939us-gaap_ShortTermBorrowings 596us-gaap_ShortTermBorrowings
Current maturities of power bonds 1,086us-gaap_UnsecuredDebtCurrent 1,032us-gaap_UnsecuredDebtCurrent
Current maturities of long-term debt of variable interest entities 33us-gaap_OtherLongTermDebtCurrent 32us-gaap_OtherLongTermDebtCurrent
Total current liabilities 4,610us-gaap_LiabilitiesCurrent 4,449us-gaap_LiabilitiesCurrent
Other liabilities    
Post-retirement and post-employment benefit obligations 5,791us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 5,839us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Asset retirement obligations 3,108us-gaap_AssetRetirementObligationsNoncurrent 3,089us-gaap_AssetRetirementObligationsNoncurrent
Other long-term liabilities 2,347us-gaap_OtherLiabilitiesNoncurrent 1,962us-gaap_OtherLiabilitiesNoncurrent
Leaseback obligations 559us-gaap_CapitalLeaseObligationsNoncurrent 616us-gaap_CapitalLeaseObligationsNoncurrent
Energy prepayment obligations 260us-gaap_DeferredRevenueNoncurrent 310us-gaap_DeferredRevenueNoncurrent
Regulatory liabilities 1us-gaap_RegulatoryLiabilityNoncurrent 0us-gaap_RegulatoryLiabilityNoncurrent
Total other liabilities 12,066us-gaap_LiabilitiesNoncurrent 11,816us-gaap_LiabilitiesNoncurrent
Long-term debt, net    
Long-term power bonds, net 21,768us-gaap_UnsecuredLongTermDebt 21,948us-gaap_UnsecuredLongTermDebt
Long-term debt of variable interest entities 1,263us-gaap_OtherLongTermDebtNoncurrent 1,279us-gaap_OtherLongTermDebtNoncurrent
Total long-term debt, net 23,031us-gaap_LongTermDebtNoncurrent 23,227us-gaap_LongTermDebtNoncurrent
Total liabilities 39,707us-gaap_Liabilities 39,492us-gaap_Liabilities
Proprietary capital    
Power program appropriation investment 258tve_AppropriationInvestmentPowerProgram 258tve_AppropriationInvestmentPowerProgram
Power program retained earnings 5,819tve_RetainedEarningsPowerProgram 5,240tve_RetainedEarningsPowerProgram
Total power program proprietary capital 6,077tve_TotalPowerProgramProprietaryCapital 5,498tve_TotalPowerProgramProprietaryCapital
Nonpower programs appropriation investment, net 595tve_AppropriationInvestmentNonpowerProgramsNet 601tve_AppropriationInvestmentNonpowerProgramsNet
Accumulated other comprehensive income (loss) 15us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 5us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total proprietary capital 6,687tve_ProprietaryCapital 6,104tve_ProprietaryCapital
Total liabilities and proprietary capital $ 46,394tve_LiabilitiesAndProprietaryCapital $ 45,596tve_LiabilitiesAndProprietaryCapital