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Subsequent Event (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Subsequent Event [Line Items]    
Subsequent Bond Repurchase $ 273  
Redemptions and repurchases of power bonds 1,218 [1] $ 1,003
Subsequent Credit on the Public Power Support and Stabilization Program $ 1  
[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.