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Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jan. 17, 2012
Short-term debt      
Coupon rate     7.10%
Short-term debt, net of discounts $ 780 $ 57  
Current maturities of long-term debt of variable interest entities issued at par 43 41  
Current maturities of notes payable 0 0  
Total Current maturities of power bonds issued at par 1,028 1,787  
Current maturities of power bonds 1,028 1,787  
Total current debt outstanding, net 1,851 1,885  
Long-term debt      
Long-term power bonds, net 17,457 17,956  
Long-term power bonds [1] 17,572 18,078  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (115) (122)  
Long-term debt of variable interest entities, net 1,006 1,048  
Total long-term debt, net 18,463 19,004  
Foreign Currency Transaction Gain (Loss), before Tax $ 58 80  
880591DX7      
Short-term debt      
Coupon rate [2] 4.65%    
Debt Instrument, Maturity Date Jun. 15, 2035    
Long-term debt      
Long-term power bonds, net $ 436 436  
880591EF5      
Short-term debt      
Coupon rate 3.77%    
Debt Instrument, Maturity Date Jun. 15, 2034    
880591EN8      
Short-term debt      
Coupon rate 1.875%    
Debt Instrument, Maturity Date Aug. 15, 2022    
Long-term debt      
Long-term power bonds, net $ 0 1,000  
880591ER9      
Short-term debt      
Coupon rate 2.875%    
Debt Instrument, Maturity Date Sep. 15, 2024    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591CJ9      
Short-term debt      
Coupon rate 6.75%    
Debt Instrument, Maturity Date Nov. 01, 2025    
Long-term debt      
Long-term power bonds, net $ 1,350 1,350  
880591EU2 [Member]      
Short-term debt      
Coupon rate 2.875%    
Debt Instrument, Maturity Date Feb. 01, 2027    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591300      
Short-term debt      
Coupon rate 2.134%    
Debt Instrument, Maturity Date Jun. 01, 2028    
Long-term debt      
Long-term power bonds, net $ 256 256  
880591409      
Short-term debt      
Coupon rate 2.216%    
Debt Instrument, Maturity Date May 01, 2029    
Long-term debt      
Long-term power bonds, net $ 208 208  
880591DM1      
Short-term debt      
Coupon rate 7.125%    
Debt Instrument, Maturity Date May 01, 2030    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591DV1      
Short-term debt      
Coupon rate 4.70%    
Debt Instrument, Maturity Date Jul. 15, 2033    
Long-term debt      
Long-term power bonds, net $ 472 472  
880591DP4      
Short-term debt      
Coupon rate 6.587%    
Debt Instrument, Maturity Date Jun. 07, 2032    
Long-term debt      
Long-term power bonds, net $ 337 323  
880591CK6      
Short-term debt      
Coupon rate 5.98%    
Debt Instrument, Maturity Date Apr. 01, 2036    
Long-term debt      
Long-term power bonds, net $ 121 121  
880591CS9      
Short-term debt      
Coupon rate 5.88%    
Debt Instrument, Maturity Date Apr. 01, 2036    
Long-term debt      
Long-term power bonds, net $ 1,500 1,500  
880591CP5      
Short-term debt      
Coupon rate 6.15%    
Debt Instrument, Maturity Date Jan. 15, 2038    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591ED0      
Short-term debt      
Coupon rate 5.50%    
Debt Instrument, Maturity Date Jun. 15, 2038    
Long-term debt      
Long-term power bonds, net $ 500 500  
880591EH1      
Short-term debt      
Coupon rate 5.25%    
Debt Instrument, Maturity Date Sep. 15, 2039    
Long-term debt      
Long-term power bonds, net $ 2,000 2,000  
880591EP3      
Short-term debt      
Coupon rate 3.50%    
Debt Instrument, Maturity Date Dec. 15, 2042    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591DU3      
Short-term debt      
Coupon rate 4.962%    
Debt Instrument, Maturity Date Jun. 07, 2043    
Long-term debt      
Long-term power bonds, net $ 202 194  
880591EB4      
Short-term debt      
Coupon rate 4.875%    
Debt Instrument, Maturity Date Jan. 15, 2048    
Long-term debt      
Long-term power bonds, net $ 500 500  
880591DZ2      
Short-term debt      
Coupon rate [2] 5.375%    
Debt Instrument, Maturity Date Apr. 01, 2056    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591EJ7      
Short-term debt      
Coupon rate 4.625%    
Debt Instrument, Maturity Date Sep. 15, 2060    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591ES7      
Short-term debt      
Coupon rate 4.25%    
Debt Instrument, Maturity Date Sep. 15, 2065    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591EW8 [Member]      
Short-term debt      
Coupon rate 0.75%    
Debt Instrument, Maturity Date May 15, 2025    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591EX6      
Short-term debt      
Coupon rate 1.50%    
Debt Instrument, Maturity Date Sep. 15, 2031    
Long-term debt      
Long-term power bonds, net $ 500 0  
880591EF5 (6.15.21)      
Long-term debt      
Long-term power bonds, net $ 190 $ 218  
[1] Includes net exchange gain from currency transactions of $58 million and $80 million at September 30, 2021 and 2020
[2] The coupon rate represents TVA's effective interest rate.