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Inventories, Net (Tables)
3 Months Ended
Dec. 31, 2023
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net
(in millions)
 At December 31, 2023At September 30, 2023
Materials and supplies inventory$884 $849 
Fuel inventory354 313 
Renewable energy certificates/emissions allowance inventory, net16 15 
Allowance for inventory obsolescence(72)(69)
Inventories, net$1,182 $1,108