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Inventories (Tables)
 3 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
December 31,
2020		September 30,
2020		December 31,
2019
Non-utility LPG and natural gas$181 $164 $164 
Gas Utility natural gas19 20 24 
Materials, supplies and other79 57 60 
Total inventories$279 $241 $248