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Debt and Other Obligations (Tables) | 3 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Debt Outstanding | Total debt outstanding at December 31, 2021, and September 30, 2021, consisted of the following:
Debt Outstanding (in millions)
| At December 31, 2021 |  | At September 30, 2021
Short-term debt |  |  |
Short-term debt, net | $ | 1,066 |  |  | $ | 780 |
Current maturities of power bonds issued at par | 1,028 |  |  | 1,028 |
Current maturities of long-term debt of VIEs issued at par | 43 |  |  | 43 |
Total current debt outstanding, net | 2,137 |  |  | 1,851 |
Long-term debt |  |  |
Long-term power bonds(1) | 17,573 |  |  | 17,572 |
Long-term debt of VIEs, net | 1,006 |  |  | 1,006 |
Unamortized discounts, premiums, issue costs, and other | (112) |  |  | (115) |
Total long-term debt, net | 18,467 |  |  | 18,463 |
Total debt outstanding | $ | 20,604 |  |  | $ | 20,314 |
Note (1) Includes net exchange gain from currency transactions of $56 million and $58 million at December 31, 2021, and September 30, 2021, respectively.
Debt Securities Activity | Debt Securities Activity The table below summarizes the long-term debt securities activity for the period from October 1, 2021, to December 31, 2021:
Debt Securities Activity
|  | Date |  | Amount (in millions) |  | Coupon Rate
Redemptions/Maturities(1) |  |  |  |  |  |
2009 Series B |  | December 2021 |  | $ | 1 |  |  | 3.770 | %
Total redemptions/maturities of debt |  |  |  | $ | 1 |  |  |
Note (1) All redemptions were at 100 percent of par.

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