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Debt and Other Obligations Debt Outstanding (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Debt Instrument |  |  |  |  |
Interest Expense | $ 14,000,000 |  |  | $ 42,000,000 | $ 43,000,000
Short-term debt |  |  |  |  |
Short-term debt, net | 1,444,186,406 | $ 1,216,000,000 |  | 1,444,186,406 |
Current maturities of power bonds | 1,029,513,817 | 1,032,000,000 |  | 1,029,513,817 |
Long-term Debt, Current Maturities | 38,623,895 |  |  | 38,623,895 |
Current maturities of long-term debt of variable interest entities | 38,623,895 | 38,000,000 |  | 38,623,895 |
Current maturities of notes payable | 23,358,527 | 46,000,000 |  | 23,358,527 |
Total current debt outstanding, net | 2,536,000,000 | 2,332,000,000 |  | 2,536,000,000 |
Long-term debt |  |  |  |  |
Long-term power bonds | 19,248,663,643 | 20,300,000,000 | [1] | 19,248,663,643 |
Long-term debt of variable interest entities | 1,108,422,699 | 1,127,000,000 |  | 1,108,422,699 |
Long-term notes payable | 0 | 23,000,000 |  | 0 |
Unamortized discounts, premiums, issues costs, and other | 133,887,622 | (143,000,000) |  | 133,887,622 |
Total long-term debt, net | 20,223,000,000 | 21,307,000,000 |  | 20,223,000,000 |
Total outstanding debt | 22,759,000,000 | 23,639,000,000 |  | $ 22,759,000,000 |
Net exchange gain from currency transactions | $ 167,000,000 | $ 147,000,000 |  |  |
[1] | Includes net exchange gain from currency transactions of $167 million and $147 million at June 30, 2019, and September 30, 2018, respec

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