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Inventories, Net (Tables)
6 Months Ended
Mar. 31, 2013
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA’s inventories:

Inventories, Net 
 
At March 31, 2013
 
At September 30, 2012
Materials and supplies inventory
$
617

 
$
605

Fuel inventory
578

 
508

Emission allowance inventory
15

 
12

Allowance for inventory obsolescence
(32
)
 
(28
)
Inventories, net
$
1,178

 
$
1,097