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Inventories (Tables)
12 Months Ended
Sep. 30, 2023
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following at September 30:
20232022
Non-utility LPG and natural gas$212 $335 
Gas Utility natural gas55 166 
Energy certificates64 70 
Materials, supplies and other102 94 
Total inventories$433 $665