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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Short-term debt |  |  |  |
Short-term debt, net |  | $ 2,721 |  | $ 1,998
Current maturities of power bonds |  | 2,031 |  | 1,728
Current maturities of long-term debt of variable interest entities |  | 36 |  | 36
Current maturities of notes payable |  | 52 |  | 53
Total current debt outstanding, net |  | 4,840 |  | 3,815
Long-term debt |  |  |  |
Long-term power bonds | [1] | 19,362 |  | 20,357
Long-term debt of variable interest entities |  | 1,175 |  | 1,175
Long-term notes payable |  | 68 |  | 69
Unamortized discounts, premiums, issues costs, and other |  | (159) |  | (163)
Total long-term debt, net |  | 20,446 |  | 21,438
Total outstanding debt |  | 25,286 |  | $ 25,253
Net exchange gain from currency transactions |  | $ 118 | $ 125 |
[1] | Includes net exchange gain from currency transactions of $118 million at December 31, 2017, and $125 million at September 30, 2017.

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