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Inventories, Net
12 Months Ended
Sep. 30, 2021
Inventory, Net [Abstract]  
Inventories, Net
4.  Inventories, Net

The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
At September 30
 20212020
Materials and supplies inventory$775 $770 
Fuel inventory198 253 
Renewable energy certificates inventory, net12 15 
Allowance for inventory obsolescence(35)(35)
Inventories, net$950 $1,003