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Subsequent Event (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Subsequent Event [Line Items]      
Redemptions and repurchases of power bonds   $ 1,286 [1] $ 1,034
Subsequent Credit on the Public Power Support and Stabilization Program   $ 1  
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Redemptions and repurchases of power bonds $ 140    
[1]
(1) The 2020 Series A Power Bonds were issued at 99.7 percent of par.
(2) All redemptions were at 100 percent of par.