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Inventories - Components of Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Inventory      
Total inventories $ 268 $ 241 $ 180
Non-utility LPG and natural gas      
Inventory      
Total inventories 179 164 110
Gas Utility natural gas      
Inventory      
Total inventories 3 20 3
Materials, supplies and other      
Inventory      
Total inventories $ 86 $ 57 $ 67