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Inventories, Net
12 Months Ended
Sep. 30, 2016
Inventory, Net [Abstract]  
Inventories, Net
Inventories, Net

The table below summarizes the types and amounts of TVA’s inventories:

Inventories, Net 
At September 30
 
2016
 
2015
Materials and supplies inventory
$
673

 
$
651

Fuel inventory
345

 
414

Emission allowance inventory, net
14

 
13

Allowance for inventory obsolescence
(39
)
 
(47
)
Inventories, net
$
993

 
$
1,031