v3.25.2
Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Inventory      
Total inventories $ 359 $ 411 $ 379
Non-utility LPG and natural gas      
Inventory      
Total inventories 159 195 186
Gas Utility natural gas      
Inventory      
Total inventories 38 50 29
Energy certificates      
Inventory      
Total inventories 64 69 60
Materials, supplies and other      
Inventory      
Total inventories $ 98 $ 97 $ 104