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Debt and Other Obligations Debt Securities Activity (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Debt Instrument      
Total long-term debt, net $ 18,800   $ 18,777
Redemptions and repurchases of power bonds 1 [1] $ 1  
Amount of letters of credit outstanding 6    
Long-term power bonds, net $ 17,867   $ 17,844
Total      
Debt Instrument      
Percent of par value 100.00%    
2009 Series B June Payment      
Debt Instrument      
Redemptions and repurchases of power bonds $ 1    
[1]
(1) All redemptions were at 100 percent of par.