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Debt and Other Obligations (Tables)
9 Months Ended
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, 2021At 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 par42 41 
Total current debt outstanding, net1,668 1,885 
Long-term debt  
Long-term power bonds(2)
18,087 18,078 
Long-term debt of VIEs, net1,028 1,048 
Unamortized discounts, premiums, issue costs, and other(115)(122)
Total long-term debt, net19,000 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 BDecember 2020$3.770 %
2011 Series AFebruary 20211,500 3.875 %
1998 Series HJune 2021331 5.805 %
2009 Series BJune 202128 3.770 %
Total redemptions/maturities of power bonds1,860 
Debt of variable interest entities20 
Total redemptions/maturities of debt$1,880 
Note
(1) All redemptions were at 100 percent of par.