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Inventories, Net (Tables)
9 Months Ended
Jun. 30, 2012
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA’s inventories:

Inventories, Net 
 
At June 30, 2012
 
At September 30, 2011
Materials and supplies inventory
$
606

 
$
555

Fuel inventory
563

 
489

Emission allowance inventory
12

 
11

Allowance for inventory obsolescence
(36
)
 
(27
)
Inventories, net
$
1,145

 
$
1,028