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Debt and Other Obligations Debt and Other Obligations - Debt Outstanding (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jan. 17, 2012
Short-term debt      
Coupon rate     7.10%
Short-term debt, net of discounts $ 432 $ 1,172  
Current maturities of long-term debt of variable interest entities issued at par 35 39  
Total Current maturities of power bonds issued at par 1,022 29  
Current maturities of power bonds 1,022 29  
Total current debt outstanding, net 1,489 1,240  
Long-term debt      
Long-term power bonds, net 17,844 17,826  
Long-term power bonds [1] 17,970 17,950  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (126) (124)  
Long-term debt of variable interest entities, net 933 968  
Total long-term debt, net $ 18,777 18,794  
880591DX7      
Short-term debt      
Coupon rate 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 $ 139 160  
880591ER9      
Short-term debt      
Coupon rate 2.875%    
Debt Instrument, Maturity Date Sep. 15, 2024    
Long-term debt      
Long-term power bonds, net $ 0 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 $ 305 279  
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 $ 183 168  
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 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 $ 500 500  
880591EY4      
Short-term debt      
Coupon rate 4.25%    
Debt Instrument, Maturity Date Sep. 15, 2052    
Long-term debt      
Long-term power bonds, net $ 500 500  
880591EZ1      
Short-term debt      
Coupon rate 3.875%    
Debt Instrument, Maturity Date Mar. 15, 2028    
Long-term debt      
Long-term power bonds, net $ 1,000 $ 0  
[1] Includes total net exchange gain from currency transactions of $109 million and $150 million at September 30, 2023 and 2022