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Inventories (Tables)
12 Months Ended
Sep. 30, 2025
Inventory Disclosure [Abstract]  
Schedule of Components of Inventories
Inventories comprise the following at September 30:
20252024
Non-utility LPG and natural gas$162 $195 
Gas Utility natural gas67 50 
Energy certificates64 69 
Materials, supplies and other92 97 
Total inventories$385 $411