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Inventories, Net
3 Months Ended
Dec. 31, 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 December 31, 2021At September 30, 2021
Materials and supplies inventory$792 $775 
Fuel inventory257 198 
Renewable energy certificates inventory, net16 12 
Allowance for inventory obsolescence(41)(35)
Inventories, net$1,024 $950