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Debt and Other Obligations Debt Outstanding (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Mar. 31, 2015		Sep. 30, 2014
Debt Instrument
Foreign Currency Transaction Gain (Loss), before Tax	$ 39us-gaap_ForeignCurrencyTransactionGainLossBeforeTax		$ (44)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Short-term debt
Short-term debt, net	939us-gaap_ShortTermBorrowings		596us-gaap_ShortTermBorrowings
Current maturities of long-term debt of variable interest entities	33us-gaap_OtherLongTermDebtCurrent		32us-gaap_OtherLongTermDebtCurrent
Current maturities of power bonds	1,086us-gaap_UnsecuredDebtCurrent		1,032us-gaap_UnsecuredDebtCurrent
Total current debt outstanding, net	2,058us-gaap_OtherShortTermBorrowings		1,660us-gaap_OtherShortTermBorrowings
Long-term debt
Long-term debt of variable interest entities	1,263us-gaap_OtherLongTermDebtNoncurrent		1,279us-gaap_OtherLongTermDebtNoncurrent
Long-term power bonds	21,853tve_LongTermPowerBonds	[1]	22,037tve_LongTermPowerBonds	[1]
Unamortized discounts, premiums and other	(85)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsOther		(89)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsOther
Total long-term debt, net	23,031us-gaap_LongTermDebtNoncurrent		23,227us-gaap_LongTermDebtNoncurrent
Total outstanding debt	$ 25,089us-gaap_DebtLongtermAndShorttermCombinedAmount		$ 24,887us-gaap_DebtLongtermAndShorttermCombinedAmount
[1] Includes net exchange gains (losses) from currency transactions of $39 million at March 31, 2015 and $(44) million at September 30, 2014.

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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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