XML 171 R81.htm IDEA: XBRL DOCUMENT v3.23.3
Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2013
Jan. 17, 2012
Debt Instrument          
Face Amount $ 40     $ 360  
Discount on debt issues (8) $ (16)      
Redemptions/Maturities of variable interest entities 39 43 $ 41    
Redemptions/Maturities of power bonds $ 29 $ 1,028 $ 1,860    
Percent of par value 99.187% 96.786%      
Total Current maturities of power bonds issued at par $ 1,022 $ 29      
Interest 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      
Long-term power bonds, net 17,844 17,826      
880591EF5 (12.15.20)          
Debt Instrument          
Total Current maturities of power bonds issued at par $ 1 1      
Interest rate 3.77%        
Debt Instrument, Maturity Date Dec. 15, 2023        
880591EF5 (6.15.21)          
Debt Instrument          
Total Current maturities of power bonds issued at par $ 21 28      
Interest rate 3.77%        
Debt Instrument, Maturity Date Jun. 15, 2024        
880591ER9          
Debt Instrument          
Total Current maturities of power bonds issued at par $ 1,000 $ 0      
Interest rate 2.875%        
Debt Instrument, Maturity Date Sep. 15, 2024        
Total          
Debt Instrument          
Debt Instrument, Redemption Period, End Date 68 1,071      
Percent of par value 100.00%        
Debt of variable interest entities          
Debt Instrument          
Redemptions/Maturities of variable interest entities $ 39 $ 43      
2009 Series B          
Debt Instrument          
Redemptions/Maturities of power bonds 29 28      
2012 Series A          
Debt Instrument          
Redemptions/Maturities of power bonds 0 1,000      
Total          
Debt Instrument          
Debt Securities Issues 992 484      
880591EY4          
Debt Instrument          
Face Amount $ 0 500      
Interest rate 4.25%        
Debt Instrument, Maturity Date Sep. 15, 2052        
Long-term power bonds, net $ 500 500      
880591EX6          
Debt Instrument          
Interest rate 1.50%        
Debt Instrument, Maturity Date Sep. 15, 2031        
Long-term power bonds, net $ 500 500      
880591EZ1          
Debt Instrument          
Interest rate 3.875%        
Debt Instrument, Maturity Date Mar. 15, 2028        
Long-term power bonds, net $ 1,000 $ 0