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Acquisitions (Narrative) (Details) - USD ($)
12 Months Ended
Feb. 09, 2017
Aug. 01, 2016
Mar. 31, 2017
Jun. 12, 2016
Apr. 01, 2016
Apr. 03, 2015
Business Acquisition [Line Items]            
Goodwill     $ 8,627,000,000   $ 3,148,000,000 $ 3,146,000,000
Consumer Digital Safety            
Business Acquisition [Line Items]            
Goodwill     2,549,000,000   1,231,000,000 1,230,000,000
Enterprise Security            
Business Acquisition [Line Items]            
Goodwill     $ 6,078,000,000   $ 1,917,000,000 $ 1,916,000,000
Convertible Debt | 2.0% Convertible Senior Notes due August 15, 2021            
Business Acquisition [Line Items]            
Stated interest rate (as a percent)     2.00%      
Blue Coat, Inc.            
Business Acquisition [Line Items]            
Total purchase price   $ 4,673,000,000        
Aggregate proceeds drawn   2,800,000,000        
Issuance of Symantec 2.0% convertible debt to Bain Capital Funds (selling shareholder)   750,000,000        
Goodwill   $ 4,083,000,000        
Net revenues attributable to acquiree     $ 427,000,000      
Transaction costs     $ 48,000,000      
Blue Coat, Inc. | Convertible Debt | 2.0% Convertible Senior Notes due August 15, 2021            
Business Acquisition [Line Items]            
Stated interest rate (as a percent)   2.00% 2.00% 2.00%    
Principal amount   $ 1,250,000,000.00   $ 1,250,000,000.00    
Blue Coat, Inc. | Convertible Debt | 5.0% Senior Notes Due 2025            
Business Acquisition [Line Items]            
Stated interest rate (as a percent) 5.00%          
LifeLock            
Business Acquisition [Line Items]            
Total purchase price $ 2,283,000,000          
Aggregate proceeds drawn 1,100,000,000          
Goodwill $ 1,401,000,000          
Transaction costs     $ 21,000,000      
Net revenues     72,000,000      
Net income (loss)     98,000,000      
LifeLock | Consumer Digital Safety            
Business Acquisition [Line Items]            
Net revenues attributable to acquiree     67,000,000      
LifeLock | Enterprise Security            
Business Acquisition [Line Items]            
Net revenues attributable to acquiree     $ 5,000,000