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Debt and Other Obligations Debt Securities Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Debt Instrument        
Total long-term debt, net $ 19,812 $ 19,812   $ 18,794
Redemptions and repurchases of power bonds   29 [1] $ 28  
Total redemptions/maturities of debt [1]   (51)    
Proceeds from Issuance of Debt   992 0  
Debt Instrument, Unamortized Discount (8) (8)    
Amount of letters of credit outstanding $ 6 $ 6    
Percent of par value 99.187% 99.187%    
Long-term power bonds, net $ 18,861 $ 18,861   $ 17,826
Repayments of Other Long-term Debt   22 $ 21  
2023 Series A        
Debt Instrument        
Long-term power bonds, net $ 1,000 $ 1,000    
Total        
Debt Instrument        
Percent of par value 100.00% 100.00%    
2009 Series B June Payment        
Debt Instrument        
Redemptions and repurchases of power bonds   $ 28    
2009 Series B [Member]        
Debt Instrument        
Redemptions and repurchases of power bonds   $ 1    
Debt of variable interest entities [Member]        
Debt Instrument        
Repayments of Other Long-term Debt $ 22      
[1]
(1) The 2023 Series A Bonds were issued at 99.187 percent of par.
(2) All redemptions were at 100 percent of par.