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Inventories (Tables)
 3 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
December 31,
2021		September 30,
2021		December 31,
2020
Non-utility LPG and natural gas$352 $278 $181 
Gas Utility natural gas65 68 19 
Energy certificates60 53 3 
Materials, supplies and other71 70 76 
Total inventories$548 $469 $279