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Debt and Other Obligations (Tables) | 3 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Debt Outstanding | Total debt outstanding at December 31, 2018, and September 30, 2018, consisted of the following:
Debt Outstanding
| At December 31, 2018 |  | At September 30, 2018
Short-term debt |  |  |
Short-term debt, net | $ | 2,333 |  |  | $ | 1,216 |
Current maturities of power bonds | 32 |  |  | 1,032 |
Current maturities of long-term debt of variable interest entities | 38 |  |  | 38 |
Current maturities of notes payable | 45 |  |  | 46 |
Total current debt outstanding, net | 2,448 |  |  | 2,332 |
Long-term debt |  |  |  |  |
Long-term power bonds(1) | 20,283 |  |  | 20,300 |
Long-term debt of variable interest entities | 1,127 |  |  | 1,127 |
Long-term notes payable | 22 |  |  | 23 |
Unamortized discounts, premiums, issue costs, and other | (140 | ) |  | (143 | )
Total long-term debt, net | 21,292 |  |  | 21,307 |
Total outstanding debt | $ | 23,740 |  |  | $ | 23,639 |
Note (1) Includes net exchange gain from currency transactions of $163 million and $147 million at December 31, 2018, and September 30, 2018, respectively.
Debt Securities Activity | The table below summarizes the long-term debt securities activity for the period from October 1, 2018, to December 31, 2018:
Debt Securities Activity
|  | Date |  | Amount(1) |  | Interest Rate
Redemptions/Maturities |  |  |  |  |  |
electronotes® |  | First Quarter 2019 |  | $ | 1 |  |  | 2.65 | %
2013 Series A |  | October 2018 |  | 1,000 |  |  | 1.75 | %
2009 Series B |  | December 2018 |  | 1 |  |  | 3.77 | %
Total redemptions/maturities of power bonds |  |  |  | 1,002 |  |  |  |
Notes payable |  |  |  | 1 |  |  | 1.64 | %
Total redemptions/maturities of debt |  |  |  | $ | 1,003 |  |  |  |
Note (1) All redemptions were at 100 percent of par.

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