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Regulatory Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Regulatory Assets and Liabilities
Current regulatory assets	$ 564us-gaap_RegulatoryAssetsCurrent	$ 481us-gaap_RegulatoryAssetsCurrent
Non-current regulatory assets	9,043us-gaap_RegulatoryAssetsNoncurrent	8,994us-gaap_RegulatoryAssetsNoncurrent
Regulatory assets	9,607us-gaap_RegulatoryAssets	9,475us-gaap_RegulatoryAssets
Current regulatory liabilities	174us-gaap_RegulatoryLiabilityCurrent	184us-gaap_RegulatoryLiabilityCurrent
Regulatory liabilities	174us-gaap_RegulatoryLiabilities	184us-gaap_RegulatoryLiabilities
Fuel cost adjustment tax equivalents
Regulatory Assets and Liabilities
Current regulatory liabilities	174us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember	182us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember
Unrealized gains/losses on commodity derivatives
Regulatory Assets and Liabilities
Current regulatory liabilities	0us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredDerivativeGainLossMember	2us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredDerivativeGainLossMember
Deferred nuclear generating units
Regulatory Assets and Liabilities
Current regulatory assets	237us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredProjectCostsMember	237us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredProjectCostsMember
Non-current regulatory assets	1,209us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredProjectCostsMember	1,255us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredProjectCostsMember
Unrealized gains/losses on commodity derivatives
Regulatory Assets and Liabilities
Current regulatory assets	205us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredDerivativeGainLossMember	134us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredDerivativeGainLossMember
Non-current regulatory assets	97us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredDerivativeGainLossMember	72us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredDerivativeGainLossMember
Environmental agreements
Regulatory Assets and Liabilities
Current regulatory assets	62us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalIssueMember	54us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalIssueMember
Non-current regulatory assets	91us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalIssueMember	108us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalIssueMember
Environmental cleanup costs - Kingston ash spill
Regulatory Assets and Liabilities
Current regulatory assets	45us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember	47us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember
Non-current regulatory assets	360us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember	421us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_EnvironmentalRestorationCostsMember
Fuel cost adjustment receivable/liability
Regulatory Assets and Liabilities
Current regulatory assets	15us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredFuelCostsMember	9us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredFuelCostsMember
Deferred pension costs and other post-retirement benefits costs
Regulatory Assets and Liabilities
Non-current regulatory assets	4,235us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember	4,297us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember
Deferred pension costs due to actions of regulator
Regulatory Assets and Liabilities
Non-current regulatory assets	51us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_DefinedBenefitPlanOtherCostsMember	0us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_DefinedBenefitPlanOtherCostsMember
Unrealized losses on interest rate derivatives
Regulatory Assets and Liabilities
Non-current regulatory assets	1,141us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_UnrealizedLossesOnInterestRateDerivativesMember	957us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_UnrealizedLossesOnInterestRateDerivativesMember
Nuclear decommissioning costs
Regulatory Assets and Liabilities
Non-current regulatory assets	908us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_NuclearDesommissioningCostsMember	931us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_NuclearDesommissioningCostsMember
Non-nuclear decommissioning costs
Regulatory Assets and Liabilities
Non-current regulatory assets	651us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_NonNuclearDecommissioningMember	645us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_NonNuclearDecommissioningMember
Other non-current regulatory assets
Regulatory Assets and Liabilities
Non-current regulatory assets	$ 300us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_OtherNonCurrentRegulatoryAssetsMember	$ 308us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = tve_OtherNonCurrentRegulatoryAssetsMember

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 340

-Section 50

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

+ References

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-Publisher FASB

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The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

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-SubTopic 405

-Section 25

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