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Inventories, Net Inventories, Net (Tables)
 12 Months Ended
Sep. 30, 2025
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
At September 30
(in millions)
 20252024
Materials and supplies inventory$986 $931 
Fuel inventory278 286 
Renewable energy certificates/emissions allowance inventory, net12 11 
Allowance for inventory obsolescence(83)(73)
Inventories, net$1,193 $1,155