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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 | $ 39 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  | $ (44)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |
Short-term debt |  |  |  |
Short-term debt, net | 939 us-gaap_ShortTermBorrowings |  | 596 us-gaap_ShortTermBorrowings |
Current maturities of long-term debt of variable interest entities | 33 us-gaap_OtherLongTermDebtCurrent |  | 32 us-gaap_OtherLongTermDebtCurrent |
Current maturities of power bonds | 1,086 us-gaap_UnsecuredDebtCurrent |  | 1,032 us-gaap_UnsecuredDebtCurrent |
Total current debt outstanding, net | 2,058 us-gaap_OtherShortTermBorrowings |  | 1,660 us-gaap_OtherShortTermBorrowings |
Long-term debt |  |  |  |
Long-term debt of variable interest entities | 1,263 us-gaap_OtherLongTermDebtNoncurrent |  | 1,279 us-gaap_OtherLongTermDebtNoncurrent |
Long-term power bonds | 21,853 tve_LongTermPowerBonds | [1] | 22,037 tve_LongTermPowerBonds | [1]
Unamortized discounts, premiums and other | (85)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsOther |  | (89)us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsOther |
Total long-term debt, net | 23,031 us-gaap_LongTermDebtNoncurrent |  | 23,227 us-gaap_LongTermDebtNoncurrent |
Total outstanding debt | $ 25,089 us-gaap_DebtLongtermAndShorttermCombinedAmount |  | $ 24,887 us-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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