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Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details)
$ in Millions
12 Months Ended
Sep. 30, 2016
USD ($)
Electronotes
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Short-term debt      
Short-term debt, net $ 1,407 $ 1,034 $ 596
Current maturities of long-term debt of variable interest entities 35 33  
Current maturities of power bonds 1,555 32  
Total current debt outstanding, net 3,024 1,099  
Current maturities of notes payable 27 0  
Long-term debt      
Long-term debt of variable interest entities, net 1,199 1,233  
Long-term notes payable 48 0  
Total long-term debt, net 22,148 23,850  
Long-term power bonds, net 20,901 22,617  
Long-term power bonds [1] 21,063 22,792  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 162 175  
Current maturities of power bonds 1,555 32  
Foreign currency exchange loss $ 150 21  
Number of issues with partial maturities | Electronotes 1    
880591DS8      
Debt Instrument      
Maturity Dec. 15, 2016    
Coupon rate 4.875%    
Long-term debt      
Long-term power bonds, net $ 0 524  
Electronotes      
Long-term debt      
Long-term power bonds, net [2] $ 278 325  
Maturity date - earliest May 15, 2020    
Maturity date - latest Feb. 15, 2043    
Call date - earliest Feb. 15, 2015    
Call date - latest Feb. 15, 2018    
880591EA6      
Debt Instrument      
Maturity Jul. 18, 2017    
Coupon rate 5.50%    
Long-term debt      
Long-term power bonds, net $ 0 1,000  
880591CU4      
Debt Instrument      
Maturity Dec. 15, 2017    
Coupon rate 6.25%    
Long-term debt      
Long-term power bonds, net $ 650 650  
880591EC2      
Debt Instrument      
Maturity Apr. 01, 2018    
Coupon rate 4.50%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591EQ1      
Debt Instrument      
Maturity Oct. 15, 2018    
Coupon rate 1.75%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591EL2      
Debt Instrument      
Maturity Feb. 15, 2021    
Coupon rate 3.875%    
Long-term debt      
Long-term power bonds, net $ 1,500 1,500  
880591DC3      
Debt Instrument      
Maturity Jun. 07, 2021    
Coupon rate [3] 5.805%    
Long-term debt      
Long-term power bonds, net $ 260 303  
880591EN8      
Debt Instrument      
Maturity Aug. 15, 2022    
Coupon rate 1.875%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591ER9      
Debt Instrument      
Maturity Sep. 15, 2024    
Coupon rate 2.875%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591CJ9      
Debt Instrument      
Maturity Nov. 01, 2025    
Coupon rate 6.75%    
Long-term debt      
Long-term power bonds, net $ 1,350 1,350  
880591300      
Debt Instrument      
Maturity Jun. 01, 2028    
Coupon rate 3.55%    
Long-term debt      
Long-term power bonds, net [4] $ 273 274  
880591409      
Debt Instrument      
Maturity May 01, 2029    
Coupon rate 3.36%    
Long-term debt      
Long-term power bonds, net [4] $ 232 232  
880591DM1      
Debt Instrument      
Maturity May 01, 2030    
Coupon rate 7.125%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591DP4      
Debt Instrument      
Maturity Jun. 07, 2032    
Coupon rate [3] 6.587%    
Long-term debt      
Long-term power bonds, net $ 324 378  
880591DV1      
Debt Instrument      
Maturity Jul. 15, 2033    
Coupon rate 4.70%    
Long-term debt      
Long-term power bonds, net $ 472 472  
880591EF5      
Debt Instrument      
Maturity Jun. 15, 2034    
Coupon rate 3.77%    
Long-term debt      
Long-term power bonds, net [5] $ 332 360  
880591DX7      
Debt Instrument      
Maturity Jun. 15, 2035    
Coupon rate 4.65%    
Long-term debt      
Long-term power bonds, net $ 436 436  
880591CK6      
Debt Instrument      
Maturity Apr. 01, 2036    
Coupon rate 5.98%    
Long-term debt      
Long-term power bonds, net $ 121 121  
880591CS9      
Debt Instrument      
Maturity Apr. 01, 2036    
Coupon rate 5.88%    
Long-term debt      
Long-term power bonds, net $ 1,500 1,500  
880591CP5      
Debt Instrument      
Maturity Jan. 15, 2038    
Coupon rate 6.15%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591ED0      
Debt Instrument      
Maturity Jun. 15, 2038    
Coupon rate 5.50%    
Long-term debt      
Long-term power bonds, net $ 500 500  
880591EH1      
Debt Instrument      
Maturity Sep. 15, 2039    
Coupon rate 5.25%    
Long-term debt      
Long-term power bonds, net $ 2,000 2,000  
880591EP3      
Debt Instrument      
Maturity Dec. 15, 2042    
Coupon rate 3.50%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591DU3      
Debt Instrument      
Maturity Jun. 07, 2043    
Coupon rate [3] 4.962%    
Long-term debt      
Long-term power bonds, net $ 195 227  
880591CF7      
Debt Instrument      
Maturity Jul. 15, 2045    
Coupon rate 6.235%    
Long-term debt      
Long-term power bonds, net $ 140 140  
Call date - earliest Jul. 15, 2020    
880591EB4      
Debt Instrument      
Maturity Jan. 15, 2048    
Coupon rate 4.875%    
Long-term debt      
Long-term power bonds, net $ 500 500  
880591DZ2      
Debt Instrument      
Maturity Apr. 01, 2056    
Coupon rate 5.375%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591EJ7      
Debt Instrument      
Maturity Sep. 15, 2060    
Coupon rate 4.625%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591ES7      
Debt Instrument      
Maturity Sep. 15, 2065    
Coupon rate 4.25%    
Long-term debt      
Long-term power bonds, net $ 1,000 1,000  
880591EE8      
Debt Instrument      
Maturity Nov. 15, 2015    
Coupon rate 2.25%    
Long-term debt      
Current maturities of power bonds $ 0 2  
880591EF5      
Debt Instrument      
Maturity Dec. 15, 2016    
Coupon rate 3.77%    
Long-term debt      
Current maturities of power bonds $ 28 27  
88059TEL1      
Debt Instrument      
Maturity Nov. 15, 2016    
Coupon rate 2.65%    
Long-term debt      
Current maturities of power bonds $ 3 3  
880591DS8      
Debt Instrument      
Maturity Dec. 15, 2016    
Coupon rate 4.875%    
Long-term debt      
Current maturities of power bonds $ 524 0  
880591EA6      
Debt Instrument      
Maturity Jul. 18, 2017    
Coupon rate 5.50%    
Long-term debt      
Current maturities of power bonds $ 1,000 $ 0  
Minimum | Electronotes      
Debt Instrument      
Coupon rate 2.375%    
Maximum | Electronotes      
Debt Instrument      
Coupon rate 4.375%    
[1] Includes net exchange gain (loss) from currency transactions of $150 million at September 30, 2016 and $21 million at September 30, 2015.
[2] Includes one electronotes® issue (88059TEL1) with partial maturities of principal for each required annual payment.
[3] The coupon rate represents TVA’s effective interest rate.
[4] TVA PARRS, CUSIP numbers 880591300 and 880591409, may be redeemed under certain conditions. See Put and Call Options above.
[5] These Bonds include partial maturities of principal for each required annual payment.