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Schedule of Property and Equipment by Geographic Area (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Identifiable Assets By Segment [Line Items]    
Property and equipment, net $ 150 $ 120
United States
   
Schedule Of Identifiable Assets By Segment [Line Items]    
Property and equipment, net 121 100
Americas (Excluding United States)
   
Schedule Of Identifiable Assets By Segment [Line Items]    
Property and equipment, net 3 3
EMEA
   
Schedule Of Identifiable Assets By Segment [Line Items]    
Property and equipment, net 9 4
APJ
   
Schedule Of Identifiable Assets By Segment [Line Items]    
Property and equipment, net $ 17 $ 13