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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2012
Property and Equipment, Net  
Property and equipment, net
   At December 31,
   2012 2011
Land $1 $1
Buildings  5  5
Leasehold improvements  80  72
Computer equipment  362  406
Office furniture and other equipment  65  49
 Total cost of property and equipment  513  533
Less accumulated depreciation  (372)  (370)
 Property and equipment, net $141 $163