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Debt and Other Obligations Debt Outstanding (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Sep. 30, 2003 Units
Debt Instrument
Foreign Currency Transaction Gain (Loss), before Tax	$ 6us-gaap_ForeignCurrencyTransactionGainLossBeforeTax		$ 44us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Proceeds prior to 2004					945tve_ProceedsPriorTo2004
Leaseback transaction, number of units					24tve_LeasebackTransactionNumberOfUnits
Proceeds in 2003					389tve_ProceedsIn2003
CT and QTE outstanding leaseback obligation	691tve_CtAndQteOutstandingLeasebackObligation		691tve_CtAndQteOutstandingLeasebackObligation
Short-term debt
Short-term debt, net	1,117us-gaap_ShortTermBorrowings		596us-gaap_ShortTermBorrowings
Current maturities of long-term debt of variable interest entities	32us-gaap_OtherLongTermDebtCurrent		32us-gaap_OtherLongTermDebtCurrent
Current maturities of power bonds	1,057us-gaap_UnsecuredDebtCurrent		1,032us-gaap_UnsecuredDebtCurrent
Total current debt outstanding, net	2,206us-gaap_OtherShortTermBorrowings		1,660us-gaap_OtherShortTermBorrowings
Long-term debt
Long-term debt of variable interest entities	1,279us-gaap_OtherLongTermDebtNoncurrent		1,279us-gaap_OtherLongTermDebtNoncurrent
Long-term power bonds	21,969tve_LongTermPowerBonds	[1]	22,037tve_LongTermPowerBonds	[1]
Unamortized discounts, premiums and other	(86)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsOther		(89)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsOther
Total long-term debt, net	23,162us-gaap_LongTermDebtNoncurrent		23,227us-gaap_LongTermDebtNoncurrent
Total outstanding debt	$ 25,368us-gaap_DebtLongtermAndShorttermCombinedAmount		$ 24,887us-gaap_DebtLongtermAndShorttermCombinedAmount
[1] Includes net exchange losses from currency transactions of $6 million at December 31, 2014 and $44 million at September 30, 2014.

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The outstanding leaseback obligations related to combustion turbine units and qualified technological equipment and software.

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Carrying value as of the balance sheet date of debt not otherwise defined (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion and excluding the unamortized discount, premiums and other.

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Proceeds received from entering into a leaseback transaction for qualified technological equipment and software in 2003.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date of the portion of long-term debt not otherwise specified in the taxonomy that is scheduled to be repaid within one year or the normal operating cycle, if longer.

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Sum of the carrying amounts at the balance sheet date of short-term borrowings not otherwise specified in the taxonomy having initial terms less than one year or the normal operating cycle, if longer.

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