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Inventories (Tables)
 9 Months Ended
Jun. 30, 2024
Inventory Disclosure [Abstract]  
Schedule of Components of Inventories
Inventories comprise the following: 
June 30,
2024		September 30,
2023		June 30,
2023
Non-utility LPG and natural gas$186 $212 $189 
Gas Utility natural gas29 55 37 
Energy certificates60 64 68 
Materials, supplies and other104 102 116 
Total inventories$379 $433 $410