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Inventories (Tables)
12 Months Ended
Sep. 30, 2022
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following at September 30:
20222021
Non-utility LPG and natural gas$335 $278 
Gas Utility natural gas166 68 
Energy certificates70 53 
Materials, supplies and other94 70 
Total inventories$665 $469