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Inventories, Net Inventories, Net (Tables)
12 Months Ended
Sep. 30, 2014
Inventory, Net [Abstract]  
Inventories, Net
The table below summarizes the types and amounts of TVA’s inventories:

Inventories, Net 
At September 30
 
2014
 
2013
Materials and supplies inventory
$
616

 
$
620

Fuel inventory
473

 
494

Emission allowance inventory
13

 
14

Allowance for inventory obsolescence
(46
)
 
(37
)
Inventories, net
$
1,056

 
$
1,091