v2.4.0.6
Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended
Nov. 30, 2012
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Loss Contingencies [Line Items]        
Rental expense under operating lease agreements   $ 167 $ 114  
Pledged or otherwise restricted cash and marketable securities as collateral   176   99
Plaintiff alleged damages to be paid $ 40      
Clouding Ip Limited Liability Company | Minimum
       
Loss Contingencies [Line Items]        
Number of patents infringed   1    
Clouding Ip Limited Liability Company | Maximum
       
Loss Contingencies [Line Items]        
Number of patents infringed   11