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Stock-Based Compensation (Narrative) (Details)
shares in Millions, $ in Millions
6 Months Ended
Aug. 01, 2016
USD ($)
plan
shares
Sep. 30, 2016
USD ($)
shares
Oct. 02, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation expense | $   $ 134 $ 0
Blue Coat, Inc.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of equity incentive plans assumed | plan 2    
Blue Coat, Inc. | CEO      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Assumed awards, fair value | $ $ 46    
Options granted (in shares) 3.9    
Options granted, fair value | $ $ 53    
Total unrecognized compensation expense | $ $ 50    
Stock Options, Vested | Blue Coat, Inc.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Assumed awards (in shares) 7.5    
Stock Options, Unvested | Blue Coat, Inc.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Assumed awards (in shares) 12.5    
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted and assumed in acquisition (in shares)   13.8 12.8
Restricted stock units | Blue Coat, Inc.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Assumed awards (in shares) 4.8    
Restricted stock units | Blue Coat, Inc. | CEO      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted and assumed in acquisition (in shares) 1.3    
Vesting period (in years) 3 years    
Performance-based restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted and assumed in acquisition (in shares)   4.9 0.9
Performance-based restricted stock units | Blue Coat, Inc.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Assumed awards (in shares) 3.0    
Performance-based restricted stock units | Blue Coat, Inc. | CEO      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted and assumed in acquisition (in shares) 1.0    
Vesting period (in years) 2 years