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Debt and Other Obligations (Tables) | 6 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Debt Outstanding | Total debt outstanding at March 31, 2019, and September 30, 2018, consisted of the following:
Debt Outstanding
| At March 31, 2019 |  | At September 30, 2018
Short-term debt |  |  |
Short-term debt, net | $ | 1,617 |  |  | $ | 1,216 |
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 | 26 |  |  | 46 |
Total current debt outstanding, net | 2,713 |  |  | 2,332 |
Long-term debt |  |  |  |  |
Long-term power bonds(1) | 19,298 |  |  | 20,300 |
Long-term debt of variable interest entities, net | 1,108 |  |  | 1,127 |
Long-term notes payable | 22 |  |  | 23 |
Unamortized discounts, premiums, issue costs, and other | (137 | ) |  | (143 | )
Total long-term debt, net | 20,291 |  |  | 21,307 |
Total outstanding debt | $ | 23,004 |  |  | $ | 23,639 |
Note (1) Includes net exchange gain from currency transactions of $146 million and $147 million at March 31, 2019, 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 March 31, 2019:
Debt Securities Activity
|  | Date |  | Amount(1) |  | Interest Rate
Redemptions/Maturities |  |  |  |  |  |
electronotes® |  | First Quarter 2019 |  | $ | 1 |  |  | 2.65 | %
electronotes® |  | Second Quarter 2019 |  | 1 |  |  | 3.48 | %
2013 Series A |  | October 2018 |  | 1,000 |  |  | 1.75 | %
2009 Series B |  | December 2018 |  | 1 |  |  | 3.77 | %
Total redemptions/maturities of power bonds |  |  |  | 1,003 |  |  |  |
Notes payable |  |  |  | 21 |  |  | 0.84 | %
Debt of variable interest entities |  |  |  | 19 |  |  | 4.31 | %
Total redemptions/maturities of debt |  |  |  | $ | 1,043 |  |  |  |
Note (1) All redemptions were at 100 percent of par.

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