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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Mar. 31, 2018
Short-term debt |  |  |
Short-term debt, net |  | $ 1,998 | $ 1,998
Current maturities of power bonds |  | 1,728 | 2,031
Current maturities of long-term debt of variable interest entities |  | 36 | 37
Current maturities of notes payable |  | 53 | 46
Total current debt outstanding, net |  | 3,815 | 4,112
Long-term debt |  |  |
Long-term power bonds | [1] | 20,357 | 20,391
Long-term debt of variable interest entities |  | 1,175 | 1,156
Long-term notes payable |  | 69 | 47
Unamortized discounts, premiums, issues costs, and other |  | (163) | (160)
Total long-term debt, net |  | 21,438 | 21,434
Total outstanding debt |  | 25,253 | 25,546
Net exchange gain from currency transactions |  | $ 125 | $ 87
[1] | Includes net exchange gain from currency transactions of $87 million and $125 million at March 31, 2018, and September 30, 2017, respectively.

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