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Risk Management Activities and Derivative Transactions Fair Values of TVA Derivatives (Details) (USD $)	Mar. 31, 2015		Sep. 30, 2014
Derivatives, Fair Value
Gross amounts of recognized liabilities	$ 1,979,000,000us-gaap_DerivativeFairValueOfDerivativeLiability		$ 1,517,000,000us-gaap_DerivativeFairValueOfDerivativeLiability
200 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(43,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_CurrencySwapMember		(15,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_CurrencySwapMember
250 million Sterling currency swap | Other long-term assets
Derivatives, Fair Value
Fair value	27,000,000us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeByNatureAxis = tve_A250MillionSterlingCurrencySwapMember		56,000,000us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeByNatureAxis = tve_A250MillionSterlingCurrencySwapMember
150 million Sterling currency swap | Other long-term assets
Derivatives, Fair Value
Fair value			8,000,000us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeByNatureAxis = tve_A150MillionSterlingCurrencySwapMember
150 million Sterling currency swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(9,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = tve_A150MillionSterlingCurrencySwapMember
$1.0 billion notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(1,225,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = tve_A10BillionNotionalInterestRateSwapMember		(987,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = tve_A10BillionNotionalInterestRateSwapMember
$476 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(460,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember		(349,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember
$42 million notional interest rate swap | Other long-term liabilities
Derivatives, Fair Value
Fair value	(12,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = tve_A42MillionNotionalInterestRateSwapMember		(12,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = tve_A42MillionNotionalInterestRateSwapMember
Commodity contract derivatives
Derivatives, Fair Value
Fair value	(149,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember		(96,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember
Commodity contract derivatives | Other Noncurrent Assets [Member]
Derivatives, Fair Value
Fair value	1,000,000us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember
Commodity contract derivatives | Other current assets
Derivatives, Fair Value
Fair value	4,000,000us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember		1,000,000us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember
Commodity contract derivatives | Other long-term liabilities
Derivatives, Fair Value
Fair value	(41,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember		(17,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember
Commodity contract derivatives | Accounts Payable and Accrued Liabilities [Member]
Derivatives, Fair Value
Fair value	(113,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember		(80,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember
Commodity derivatives under FTP
Derivatives, Fair Value
Fair value	(157,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember	[1]	(103,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember	[1]
Commodity derivatives under FTP | Other current assets
Derivatives, Fair Value
Gross amounts of recognized liabilities	112,000,000us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember		69,000,000us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember
Fair value	(112,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember		(69,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember
Commodity derivatives under FTP | Other long-term liabilities
Derivatives, Fair Value
Fair value	(14,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember		(14,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember
Commodity derivatives under FTP | Accounts Payable and Accrued Liabilities [Member]
Derivatives, Fair Value
Fair value	$ (31,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember		$ (20,000,000)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableAndAccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_OtherContractMember
[1] Fair values of certain derivatives under the FTP that were in net liability positions totaling $112 million and $69 million at March 31, 2015 and September 30, 2014, respectively, are recorded in TVA's margin cash accounts in Other current assets. These derivatives are transacted with futures commission merchants, and cash deposits have been posted to the margin cash accounts held with each futures commission merchant to offset the net liability positions in full.

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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-Name Accounting Standards Codification

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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