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Inventories, Net Inventories, Net (Tables)
12 Months Ended
Sep. 30, 2023
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
At September 30
(in millions)
 20232022
Materials and supplies inventory$849 $808 
Fuel inventory313 303 
Renewable energy certificates/emissions allowance inventory, net15 18 
Allowance for inventory obsolescence(69)(57)
Inventories, net$1,108 $1,072