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Inventories
 3 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Inventories
Note 6 — Inventories

Inventories comprise the following: 
December 31,
2023		September 30,
2023		December 31,
2022
Non-utility LPG and natural gas$217 $212 $310 
Gas Utility natural gas46 55 129 
Energy certificates71 64 78 
Materials, supplies and other107 102 101 
Total inventories$441 $433 $618