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Inventories, Net (Tables)
3 Months Ended
Dec. 31, 2012
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA’s inventories:

Inventories, Net 
 
At December 31, 2012
 
At September 30, 2012
Materials and supplies inventory
$
608

 
$
605

Fuel inventory
504

 
508

Emission allowance inventory
13

 
12

Allowance for inventory obsolescence
(31
)
 
(28
)
Inventories, net
$
1,094

 
$
1,097