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Debt and Other Obligations Debt Outstanding (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2019
Debt Instrument |  |  |
Foreign Currency Transactions, Description |  |  | 146
Short-term debt |  |  |
Short-term debt, net |  | $ 1,216 | $ 1,617
Current maturities of power bonds |  | 1,032 | 1,032
Current maturities of long-term debt of variable interest entities |  | 38 | 38
Current maturities of notes payable |  | 46 | 26
Total current debt outstanding, net |  | 2,332 | 2,713
Long-term debt |  |  |
Long-term power bonds | [1] | 20,300 | 19,298
Long-term debt of variable interest entities |  | 1,127 | 1,108
Long-term notes payable |  | 23 | 22
Unamortized discounts, premiums, issues costs, and other |  | (143) | (137)
Total long-term debt, net |  | 21,307 | 20,291
Total outstanding debt |  | 23,639 | $ 23,004
Net exchange gain from currency transactions |  | $ 147 |
[1] | Includes net exchange gain from currency transactions of $146 million and $147 million at March 31, 2019, and September 30, 2018, respectively.

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