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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Sep. 30, 2015
Short-term debt |  |  |
Short-term debt, net |  | $ 1,542 | $ 1,034
Current maturities of power bonds |  | 555 | 32
Current maturities of long-term debt of variable interest entities |  | 34 | 33
Total current debt outstanding, net |  | 2,131 | 1,099
Long-term debt |  |  |
Long-term power bonds | [1] | 22,125 | 22,792
Long-term debt of variable interest entities |  | 1,229 | 1,246
Unamortized discounts, premiums, issues costs, and other |  | (177) | (188)
Total long-term debt, net |  | 23,177 | 23,850
Total outstanding debt |  | 25,308 | 24,949
Net exchange gain from currency transactions |  | $ 130 | $ 21
[1] | Includes net exchange gain from currency transactions of $130 million at June 30, 2016, and $21 million at September 30, 2015.

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