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Inventories, Net (Tables)
6 Months Ended
Mar. 31, 2021
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
 At March 31, 2021At September 30, 2020
Materials and supplies inventory$767 $770 
Fuel inventory263 253 
Renewable energy certificates inventory, net18 15 
Allowance for inventory obsolescence(34)(35)
Inventories, net$1,014 $1,003