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Inventories, Net (Tables)
9 Months Ended
Jun. 30, 2022
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net
(in millions)
 At June 30, 2022At September 30, 2021
Materials and supplies inventory$804 $775 
Fuel inventory246 198 
Renewable energy certificates/emissions allowance inventory, net18 12 
Allowance for inventory obsolescence(55)(35)
Inventories, net$1,013 $950