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Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2016
Jan. 17, 2012
Debt Instrument        
Debt Securities   $ 1,000    
Short-term debt        
Coupon rate       7.10%
Short-term debt, net of discounts $ 1,998 1,216 $ 1,407  
Current maturities of long-term debt of variable interest entities issued at par 36 38    
Current maturities of notes payable 53 46    
Total Current maturities of power bonds issued at par 1,728 1,032    
Current maturities of power bonds 1,728 1,032    
Total current debt outstanding, net 3,815 2,332    
Long-term debt        
Long-term power bonds, net 20,205 20,157    
Long-term power bonds [1] 20,357 20,300    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 152 (143)    
Long-term debt of variable interest entities, net 1,164 1,127    
Long-term notes payable 69 23    
Total long-term debt, net 21,438 21,307    
Foreign Currency Transaction Gain (Loss), before Tax 125 $ 147    
880591EV0 [Member]        
Short-term debt        
Coupon rate   2.25%    
Debt Instrument, Maturity Date   Mar. 15, 2020    
Long-term debt        
Long-term power bonds, net 0 $ 1,000    
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    
Long-term debt        
Long-term power bonds, net 303 $ 273    
880591DC3        
Short-term debt        
Coupon rate   5.805%    
Debt Instrument, Maturity Date   Jun. 07, 2021    
Long-term debt        
Long-term power bonds, net 268 $ 261    
880591EL2        
Short-term debt        
Coupon rate   3.875%    
Debt Instrument, Maturity Date   Feb. 15, 2021    
Long-term debt        
Long-term power bonds, net 1,500 $ 1,500    
880591EQ1        
Short-term debt        
Coupon rate   1.75%    
Debt Instrument, Maturity Date   Oct. 15, 2018    
Long-term debt        
Long-term power bonds, net 1,000 $ 0    
electronotes        
Long-term debt        
Maturity date - earliest   May 15, 2020    
Maturity date - latest   Feb. 15, 2043    
Call date - earliest   Feb. 15, 2015    
Call date - latest   Feb. 15, 2018    
Long-term power bonds, net 226 $ 221    
880591EN8        
Short-term debt        
Coupon rate   1.875%    
Debt Instrument, Maturity Date   Aug. 15, 2022    
Long-term debt        
Long-term power bonds, net 1,000 $ 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   3.55%    
Debt Instrument, Maturity Date   Jun. 01, 2028    
Long-term debt        
Long-term power bonds, net 273 $ 273    
880591409        
Short-term debt        
Coupon rate   3.36%    
Debt Instrument, Maturity Date   May 01, 2029    
Long-term debt        
Long-term power bonds, net 232 $ 232    
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 [3] $ 472    
880591DP4        
Short-term debt        
Coupon rate   6.587%    
Debt Instrument, Maturity Date   Jun. 07, 2032    
Long-term debt        
Long-term power bonds, net 335 [3] $ 326    
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 [4] $ 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 201 $ 195    
880591CF7        
Short-term debt        
Coupon rate   6.235%    
Debt Instrument, Maturity Date   Jul. 15, 2045    
Long-term debt        
Long-term power bonds, net 140 $ 140    
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    
880591EQ1        
Short-term debt        
Coupon rate   1.75%    
Total Current maturities of power bonds issued at par 0 $ 1,000    
Debt Instrument, Maturity Date   Oct. 15, 2018    
880591EF5 (6/15/2018)        
Short-term debt        
Total Current maturities of power bonds issued at par 28 $ 29    
Debt Instrument, Maturity Date   Jun. 15, 2019    
88059TFS5        
Short-term debt        
Coupon rate   4.125%    
Debt Instrument, Maturity Date   Oct. 15, 2017    
Bonds outstanding with survivor's option 46 $ 0    
880591EF5        
Short-term debt        
Coupon rate   3.77%    
Total Current maturities of power bonds issued at par 1 $ 1    
Debt Instrument, Maturity Date   Dec. 15, 2018    
88059TEL1        
Short-term debt        
Coupon rate   2.65%    
Total Current maturities of power bonds issued at par 1 $ 1    
Debt Instrument, Maturity Date   Nov. 15, 2018    
88059TEL1 (5/15/2018)        
Short-term debt        
Total Current maturities of power bonds issued at par 2 $ 1    
Debt Instrument, Maturity Date   May 15, 2019    
880591DS8        
Short-term debt        
Total Current maturities of power bonds issued at par 650 $ 0    
Debt Instrument, Maturity Date   Dec. 15, 2017    
880591EA6        
Short-term debt        
Total Current maturities of power bonds issued at par $ 1,000 $ 0    
Debt Instrument, Maturity Date   Apr. 01, 2018    
880591EC2        
Short-term debt        
Coupon rate   4.50%    
880591CU4        
Short-term debt        
Coupon rate   6.25%    
Minimum | electronotes        
Short-term debt        
Coupon rate   2.375%    
Maximum | electronotes        
Short-term debt        
Coupon rate   3.625%    
[1] Includes net exchange gain from currency transactions of $147 million and $125 million at September 30, 2018 and
[2] The coupon rate represents TVA’s effective interest rate.
[3] TVA PARRS, CUSIP numbers 880591300 and 880591409, may be redeemed under certain conditions. See Put and Call Options above.
[4] (2) Includes one electronotes® issue with partial maturities of principal for each required annual payment.