XML 118 R87.htm IDEA: XBRL DOCUMENT v3.22.1
Subsequent Event (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Subsequent Event [Line Items]    
Redemptions and repurchases of power bonds $ 1 [1] $ 1,501
[1] (1) All redemptions were at 100 percent of par.