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Inventories, Net (Tables)
6 Months Ended
Mar. 31, 2016
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA’s inventories:
Inventories, Net 
 
At March 31, 2016
 
At September 30, 2015
Materials and supplies inventory
$
680

 
$
651

Fuel inventory
442

 
414

Emission allowance inventory, net
15

 
13

Allowance for inventory obsolescence
(56
)
 
(47
)
Inventories, net
$
1,081

 
$
1,031