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Debt and Other Obligations Debt Securities Activity (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument          
Long-term notes payable $ 1        
Total long-term debt, net 18,439   $ 20,183    
Redemptions and repurchases of power bonds $ 1,218 [1] $ 1,003      
Variable Interest Entity, Financial or Other Support, Type 20        
Total redemptions/maturities of debt [1] $ (1,238)        
electronotes [Member]          
Debt Instrument          
Redemptions and repurchases of power bonds 217        
2009 Series B [Member]          
Debt Instrument          
Redemptions and repurchases of power bonds $ 1 $ 1,000      
Total          
Debt Instrument          
Percent of par value 100.00%        
Debt of variable interest entities [Member]          
Debt Instrument          
Other Debt instrument, Interest Rate, Effective Percentage       4.00%  
electronotes [Member]          
Debt Instrument          
Debt Instrument, Interest Rate, Effective Percentage 3.00%        
2009 Series B [Member]          
Debt Instrument          
Debt Instrument, Interest Rate, Effective Percentage 4.00%       2.00%
[1] (1) Amounts for notes payable were less than $1 million at March 31, 2020, and are therefore not represented in the table above.(2) All redemptions were at 100 percent of par.