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Commitments and Contingencies (Narrative) (Details)
$ in Millions
12 Months Ended 69 Months Ended
Aug. 04, 2015
USD ($)
patent
Aug. 28, 2013
patent
Mar. 31, 2017
USD ($)
Apr. 01, 2016
USD ($)
Apr. 03, 2015
USD ($)
Sep. 30, 2012
USD ($)
Dec. 30, 2016
USD ($)
Aug. 31, 2015
USD ($)
Jan. 31, 2014
USD ($)
Commitments and Contingencies Disclosure [Abstract]                  
Rent expense     $ 79 $ 103 $ 113        
Loss Contingencies [Line Items]                  
Total net revenues     4,019 $ 3,600 $ 3,956        
GSA Schedule Contract                  
Loss Contingencies [Line Items]                  
Total net revenues           $ 222      
GSA analysis of damage exposure                 $ 145
Class Action Lawsuit vs. Symantec, Extended Download Services and Norton Download Insurance                  
Loss Contingencies [Line Items]                  
Loss contingency accrual               $ 30  
Finjan, Inc vs. Blue Coat Systems, Inc. | Pending Litigation                  
Loss Contingencies [Line Items]                  
Patents allegedly infringed, number | patent   6              
Finjan, Inc vs. Blue Coat Systems, Inc. | Judicial Ruling                  
Loss Contingencies [Line Items]                  
Current estimate of the low end of the range of estimated loss             $ 40    
Damages awarded $ 40                
Patents found infringed, number | patent 5                
Minimum | GSA Schedule Contract                  
Loss Contingencies [Line Items]                  
Current estimate of the low end of the range of estimated loss     $ 25