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Subsequent Event (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Subsequent Event [Line Items]          
Redemptions and repurchases of power bonds     $ 29 [1] $ 28  
Current regulatory assets $ 236   236   $ 138
Operating and maintenance 896 $ 722 2,546 2,269  
Interest expense 264 $ 264 794 $ 791  
Non-current regulatory assets 5,666   5,666   6,134
Regulatory Liability, Noncurrent 59   59   172
Unrealized gains/losses on commodity derivatives          
Subsequent Event [Line Items]          
Regulatory Liability, Noncurrent 1   1   102
Unrealized gains/losses on commodity derivatives          
Subsequent Event [Line Items]          
Current regulatory assets 180   180   14
Non-current regulatory assets $ 78   $ 78   $ 1
[1]
(1) The 2023 Series A Bonds were issued at 99.187 percent of par.
(2) All redemptions were at 100 percent of par.