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Debt and Other Obligations Debt Securities Activity (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Debt Instrument      
Total long-term debt, net $ 17,763   $ 18,777
Repayments of Unsecured Debt 22 [1] $ 29  
Amount of letters of credit outstanding $ 6    
Percent of par value 100.00%    
Long-term power bonds, net $ 16,848   $ 17,844
Repayments of Other Long-term Debt $ 17 $ 22  
Debt Instrument, Redemption, Description 39    
2009 series B      
Debt Instrument      
Repayments of Unsecured Debt $ 1    
2009 Series B June Payment      
Debt Instrument      
Repayments of Unsecured Debt $ 21    
[1]
(1) All redemptions were at 100 percent of par.