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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities    
Net income (loss) $ 577us-gaap_NetIncomeLoss $ 228us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities    
Depreciation and amortization (including amortization of debt issuance costs and premiums/discounts) 929us-gaap_DepreciationAmortizationAndAccretionNet 917us-gaap_DepreciationAmortizationAndAccretionNet
Amortization of nuclear fuel cost 140us-gaap_AmortizationOfNuclearFuelLease 143us-gaap_AmortizationOfNuclearFuelLease
Non-cash retirement benefit expense 166us-gaap_PensionAndOtherPostretirementBenefitExpense 286us-gaap_PensionAndOtherPostretirementBenefitExpense
Prepayment credits applied to revenue (50)us-gaap_RecognitionOfDeferredRevenue (50)us-gaap_RecognitionOfDeferredRevenue
Fuel cost adjustment deferral (61)us-gaap_IncreaseDecreaseInDeferredFuelCosts (162)us-gaap_IncreaseDecreaseInDeferredFuelCosts
Fuel cost tax equivalents (13)tve_FuelCostTaxEquivalents (3)tve_FuelCostTaxEquivalents
Changes in current assets and liabilities    
Accounts receivable, net 243us-gaap_IncreaseDecreaseInAccountsReceivable 116us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories and other, net (139)us-gaap_IncreaseDecreaseInInventories 62us-gaap_IncreaseDecreaseInInventories
Accounts payable and accrued liabilities (249)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (96)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accrued interest 16us-gaap_IncreaseDecreaseInInterestPayableNet 19us-gaap_IncreaseDecreaseInInterestPayableNet
Regulatory assets costs (17)tve_Regulatoryassetscosts (39)tve_Regulatoryassetscosts
Pension contributions (144)us-gaap_PensionContributions (132)us-gaap_PensionContributions
Insurance recoveries 50us-gaap_ProceedsFromInsuranceSettlementOperatingActivities 161us-gaap_ProceedsFromInsuranceSettlementOperatingActivities
Other, net (36)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (24)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities 1,412us-gaap_NetCashProvidedByUsedInOperatingActivities 1,426us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities    
Construction expenditures (1,407)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,141)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Nuclear fuel expenditures (216)us-gaap_PaymentsForProceedsFromNuclearFuel (239)us-gaap_PaymentsForProceedsFromNuclearFuel
Purchases of investments (1)us-gaap_PaymentsToAcquireInvestments 0us-gaap_PaymentsToAcquireInvestments
Loans and other receivables    
Advances (11)us-gaap_PaymentsToAcquireLoansReceivable (1)us-gaap_PaymentsToAcquireLoansReceivable
Repayments 5us-gaap_ProceedsFromCollectionOfLoansReceivable 4us-gaap_ProceedsFromCollectionOfLoansReceivable
Other, net (14)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 3us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (1,644)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,374)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities    
Redemptions and repurchases of power bonds (46)us-gaap_RepaymentsOfUnsecuredDebt (333)us-gaap_RepaymentsOfUnsecuredDebt
Redemptions of variable interest entities (15)us-gaap_RepaymentsOfOtherLongTermDebt (15)us-gaap_RepaymentsOfOtherLongTermDebt
Short-term debt issues (redemptions), net 343us-gaap_ProceedsFromRepaymentsOfShortTermDebt (741)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Payments on leases and leasebacks (56)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (50)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Payments to U.S. Treasury (4)tve_PaymentsToUSTreasury (7)tve_PaymentsToUSTreasury
Other, net 12us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (2)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities 234us-gaap_NetCashProvidedByUsedInFinancingActivities (1,148)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents 2us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,096)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 500us-gaap_CashAndCashEquivalentsAtCarryingValue 1,602us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 502us-gaap_CashAndCashEquivalentsAtCarryingValue 506us-gaap_CashAndCashEquivalentsAtCarryingValue
Significant non-cash transactions    
Accrued capital and nuclear fuel expenditures $ 251tve_Accruedcapitalandnuclearfuelexpenditures $ 180tve_Accruedcapitalandnuclearfuelexpenditures