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Inventories, Net
9 Months Ended
Jun. 30, 2021
Inventory, Net [Abstract]  
Inventories, Net Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net
(in millions)
 At June 30, 2021At September 30, 2020
Materials and supplies inventory$783 $770 
Fuel inventory246 253 
Renewable energy certificates inventory, net12 15 
Allowance for inventory obsolescence(35)(35)
Inventories, net$1,006 $1,003