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Debt and Other Obligations Debt Securities Activity (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Debt Instrument      
Total long-term debt, net $ 18,368   $ 18,463
Redemptions and repurchases of power bonds $ 28 [1] $ 1,860  
Variable Interest Entity, Financial or Other Support, Type 21    
Total redemptions/maturities of debt [1] $ (49)    
2009 Series B June Payment      
Debt Instrument      
Redemptions and repurchases of power bonds 27    
2009 Series B [Member]      
Debt Instrument      
Redemptions and repurchases of power bonds $ 1    
[1] (1) All redemptions were at 100 percent of par.