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Debt and Other Obligations (Tables) | 9 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Debt Outstanding | Total debt outstanding at June 30, 2021, and September 30, 2020, consisted of the following:
Debt Outstanding (in millions)
| At June 30, 2021 |  | At September 30, 2020
Short-term debt |  |  |
Short-term debt, net | $ | 1,598 |  |  | $ | 57 |
Current maturities of power bonds issued at par(1) | 28 |  |  | 1,787 |
Current maturities of long-term debt of VIEs issued at par | 42 |  |  | 41 |
Total current debt outstanding, net | 1,668 |  |  | 1,885 |
Long-term debt |  |  |
Long-term power bonds(2) | 18,087 |  |  | 18,078 |
Long-term debt of VIEs, net | 1,028 |  |  | 1,048 |
Unamortized discounts, premiums, issue costs, and other | (115) |  |  | (122) |
Total long-term debt, net | 19,000 |  |  | 19,004 |
Total debt outstanding | $ | 20,668 |  |  | $ | 20,889 |
Notes (1) Includes net exchange gain from currency transactions of $73 million at September 30, 2020. On June 7, 2021, the 1998 series H Sterling Global bond matured, and the remaining exchange gain offset the maturity of the related currency swap. (2) Includes net exchange gain from currency transactions of $44 million and $80 million at June 30, 2021, and September 30, 2020, respectively.
Debt Securities Activity | Debt Securities Activity The table below summarizes the long-term debt securities activity for the period from October 1, 2020, to June 30, 2021:
Debt Securities Activity
|  | Date |  | Amount (in millions) |  | Coupon Rate
Redemptions/Maturities(1) |  |  |  |  |  |
2009 Series B |  | December 2020 |  | $ | 1 |  |  | 3.770 | %
2011 Series A |  | February 2021 |  | 1,500 |  |  | 3.875 | %
1998 Series H |  | June 2021 |  | 331 |  |  | 5.805 | %
2009 Series B |  | June 2021 |  | 28 |  |  | 3.770 | %
Total redemptions/maturities of power bonds |  |  |  | 1,860 |  |  |
Debt of variable interest entities |  |  |  | 20 |  |  |
Total redemptions/maturities of debt |  |  |  | $ | 1,880 |  |  |
Note (1) All redemptions were at 100 percent of par.

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