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Inventories, Net
3 Months Ended
Dec. 31, 2018
Inventory, Net [Abstract]  
Inventories, Net
Inventories, Net

The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
 
At December 31, 2018
 
At September 30, 2018
Materials and supplies inventory
$
731

 
$
725

Fuel inventory
315

 
266

Renewable energy certificates/emission allowance inventory, net
15

 
14

Allowance for inventory obsolescence
(43
)
 
(44
)
Inventories, net
$
1,018

 
$
961