v3.25.1
Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Inventory      
Total inventories $ 341 $ 411 $ 375
Non-utility LPG and natural gas      
Inventory      
Total inventories 179 195 196
Gas Utility natural gas      
Inventory      
Total inventories 6 50 8
Energy certificates      
Inventory      
Total inventories 58 69 63
Materials, supplies and other      
Inventory      
Total inventories $ 98 $ 97 $ 108