v3.25.2
Subsequent Event (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Subsequent Event [Line Items]          
Repayments of Unsecured Debt     $ 1,022 [1] $ 22  
Current regulatory assets $ 152   152   $ 191
Interest expense 307 $ 267 880 $ 795  
Non-current regulatory assets 9,137   9,137   9,408
Unrealized gains/losses on commodity derivatives          
Subsequent Event [Line Items]          
Current regulatory assets 22   22   102
Non-current regulatory assets $ 8   $ 8   $ 64
[1]
(3) All redemptions were at 100 percent of par.