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Inventories (Tables)
 9 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
June 30,
2022		September 30,
2021		June 30,
2021
Non-utility LPG and natural gas$261 $278 $187 
Gas Utility natural gas84 68 16 
Energy certificates70 53 42 
Materials, supplies and other81 70 51 
Total inventories$496 $469 $296