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Inventories, Net (Tables)
6 Months Ended
Mar. 31, 2024
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net
(in millions)
 At March 31, 2024At September 30, 2023
Materials and supplies inventory$867 $849 
Fuel inventory321 313 
Renewable energy certificates/emissions allowance inventory, net12 15 
Allowance for inventory obsolescence(73)(69)
Inventories, net$1,127 $1,108