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Inventories
3 Months Ended
Mar. 31, 2013
Inventory, Net [Abstract]  
Inventories
Inventories
The principal categories of inventories are:
 
 
March 31,
2013
 
December 31, 2012
Finished goods
$
569

 
$
585

Work in process
39

 
36

Raw materials
103

 
101

Total
$
711

 
$
722