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Acquisitions and Divestitures (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 24, 2017
USD ($)
Business
Feb. 09, 2017
USD ($)
Jul. 31, 2017
USD ($)
Sep. 29, 2017
USD ($)
Dec. 29, 2017
USD ($)
Dec. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
[1]
Business Acquisition [Line Items]              
Payments for acquisitions, net of cash acquired         $ 402 $ 4,533  
Goodwill         8,318   $ 8,627
Fireglass, Ltd. and Skycure, Ltd.              
Business Acquisition [Line Items]              
Payments for acquisitions, net of cash acquired     $ 345        
Cash acquired     $ 15        
Number of businesses acquired | Business 2            
Goodwill $ 247            
Privately-held Companies              
Business Acquisition [Line Items]              
Cash acquired         1    
Consideration for the acquisitions         66    
Goodwill         $ 48    
Blue Coat, Inc.              
Business Acquisition [Line Items]              
Consideration for the acquisitions       $ 4,670      
LifeLock              
Business Acquisition [Line Items]              
Liabilities incurred For dissenting shareholders   $ 68          
Cash settlement of dissenting shareholders       74      
LifeLock | General and administrative              
Business Acquisition [Line Items]              
Cash settlement of dissenting shareholders       $ 6      
[1] Derived from audited financial statements.