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Inventories (Tables)
 6 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Schedule of Components of Inventories
Inventories comprise the following: 
March 31,
2024		September 30,
2023		March 31,
2023
Non-utility LPG and natural gas$196 $212 $230 
Gas Utility natural gas8 55 20 
Energy certificates63 64 76 
Materials, supplies and other108 102 107 
Total inventories$375 $433 $433