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Inventories, Net
3 Months Ended
Dec. 31, 2020
Inventory, Net [Abstract]  
Inventories, Net Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
 At December 31, 2020At September 30, 2020
Materials and supplies inventory$781 $770 
Fuel inventory301 253 
Renewable energy certificates inventory, net17 15 
Allowance for inventory obsolescence(35)(35)
Inventories, net$1,064 $1,003