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Inventories, Net (Tables)
 3 Months Ended
Dec. 31, 2016
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA’s inventories:
Inventories, Net 
 
At December 31, 2016
 
At September 30, 2016
Materials and supplies inventory
$
728

 
$
673

Fuel inventory
410

 
345

Emission allowance inventory, net
15

 
14

Allowance for inventory obsolescence
(33
)
 
(39
)
Inventories, net
$
1,120

 
$
993