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Inventories, Net (Tables)
6 Months Ended
Mar. 31, 2015
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA’s inventories:
Inventories, Net 
 
At March 31, 2015
 
At September 30, 2014
Materials and supplies inventory
$
635

 
$
616

Fuel inventory
520

 
473

Emission allowance inventory
16

 
13

Allowance for inventory obsolescence
(36
)
 
(46
)
Inventories, net
$
1,135

 
$
1,056