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Inventories, Net (Tables)
6 Months Ended
Mar. 31, 2025
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net
(in millions)
 At March 31, 2025At September 30, 2024
Materials and supplies inventory$970 $931 
Fuel inventory284 286 
Renewable energy certificates/emissions allowance inventory, net11 
Allowance for inventory obsolescence(81)(73)
Inventories, net$1,182 $1,155