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Debt and Other Obligations (Tables)
6 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Debt Outstanding
Total debt outstanding at March 31, 2021, and September 30, 2020, consisted of the following:
Debt Outstanding 
(in millions)
 At March 31, 2021At September 30, 2020
Short-term debt  
Short-term debt, net$1,241 $57 
Current maturities of power bonds issued at par(1)
304 1,787 
Current maturities of long-term debt of VIEs issued at par42 41 
Total current debt outstanding, net1,587 1,885 
Long-term debt  
Long-term power bonds(2)
18,112 18,078 
Long-term debt of VIEs, net1,028 1,048 
Unamortized discounts, premiums, issue costs, and other(117)(122)
Total long-term debt, net19,023 19,004 
Total debt outstanding$20,610 $20,889 
Notes
(1) Includes net exchange gain from currency transactions of $56 million and $73 million at March 31, 2021, and September 30, 2020, respectively.
(2) Includes net exchange gain from currency transactions of $46 million and $80 million at March 31, 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 March 31, 2021:
Debt Securities Activity
 Date
Amount
(in millions)
Interest Rate
Redemptions/Maturities(1)
  
2009 Series BDecember 2020$3.77 %
2011 Series AFebruary 20211,500 3.88 %
Total redemptions/maturities of power bonds1,501 
Debt of variable interest entities20 
Total redemptions/maturities of debt$1,521 
Note
(1) All redemptions were at 100 percent of par.