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Inventories, Net (Tables)
 3 Months Ended
Dec. 31, 2019
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
 
At December 31, 2019
 
At September 30, 2019
Materials and supplies inventory
$
752

 
$
742

Fuel inventory
337

 
294

Renewable energy certificates/emission allowance inventory, net
17

 
16

Allowance for inventory obsolescence
(54
)
 
(53
)
Inventories, net
$
1,052

 
$
999