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Inventories
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories
The principal categories of inventories are:
 
 
June 30,
2015
 
December 31, 2014
Finished goods
$
595

 
$
568

Work in process
34

 
28

Raw materials
113

 
103

Total
$
742

 
$
699