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Inventories, Net
 9 Months Ended
Jun. 30, 2020
Inventory, Net [Abstract]  
Inventories, Net Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
 At June 30, 2020At September 30, 2019
Materials and supplies inventory$784  $742  
Fuel inventory307  294  
Renewable energy certificates/emission allowance inventory, net15  16  
Allowance for inventory obsolescence(46) (53) 
Inventories, net$1,060  $999