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Inventories, Net
9 Months Ended
Jun. 30, 2018
Inventory, Net [Abstract]  
Inventories, Net
Inventories, Net

The table below summarizes the types and amounts of TVA's inventories:
Inventories, Net 
 
At June 30, 2018
 
At September 30, 2017
Materials and supplies inventory
$
775

 
$
734

Fuel inventory
304

 
355

Renewable energy certificates/emission allowance inventory, net
13

 
15

Allowance for inventory obsolescence
(42
)
 
(39
)
Inventories, net
$
1,050

 
$
1,065