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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended 6 Months Ended 69 Months Ended
Aug. 04, 2015
USD ($)
patent
Aug. 28, 2013
patent
Sep. 29, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 29, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2012
USD ($)
Jan. 31, 2014
USD ($)
Loss Contingencies [Line Items]                
Net revenues     $ 1,240 $ 979 $ 2,415 $ 1,863    
GSA Schedule Contract                
Loss Contingencies [Line Items]                
Net revenues             $ 222  
GSA initial analysis of damage exposure               $ 145
GSA Schedule Contract | Minimum                
Loss Contingencies [Line Items]                
Estimated loss     25   25      
Finjan, Inc vs. Blue Coat Systems, Inc. | Pending Litigation                
Loss Contingencies [Line Items]                
Number of patents allegedly infringed | patent   6            
Finjan, Inc vs. Blue Coat Systems, Inc. | Judicial Ruling                
Loss Contingencies [Line Items]                
Estimated loss     $ 40   $ 40      
Number of patents found infringed | patent 5              
Damages awarded $ 40