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Stock-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Aug. 01, 2016
USD ($)
plan
shares
Oct. 31, 2014
Nov. 30, 2014
Mar. 31, 2017
USD ($)
purchase_periods
$ / shares
shares
Apr. 01, 2016
USD ($)
$ / shares
shares
Apr. 03, 2015
USD ($)
$ / shares
Feb. 09, 2017
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares reserved for issuance (in shares)       115,000,000      
Employee Stock Purchase Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum employee subscription rate (up to) (as a percent)       10.00%      
Purchase price of common stock (as a percent)       85.00%      
Award purchase period (in months)       6 months      
Stock issued under employee stock purchase plan (in shares)       31,000,000      
Shares reserved for issuance (in shares)       39,000,000      
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Periods, Number | purchase_periods       2      
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Period       6 years      
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period (in years)   4 years 3 years        
Weighted-average fair value per grant (in dollars per share) | $ / shares       $ 20.56 $ 23.20 $ 22.66  
Total fair value of restricted stock vested and released | $       $ 181 $ 250 $ 133  
Total unrecognized compensation cost adjusted for estimated forfeitures | $       $ 278      
Weighted-average period in years over which stock based compensation cost is expected to be recognized (in years)       1 year 9 months      
Number of share granted (in shares)       18,000,000      
Number of unvested shares (in shares)       23,000,000 17,000,000    
Number of shares released (in shares)       8,000,000      
Aggregate Intrinsic Value, Outstanding and unvested at end of year | $       $ 692      
Performance Based Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted-average fair value per grant (in dollars per share) | $ / shares       $ 19.99      
Number of share granted (in shares)       5,000,000      
Number of unvested shares (in shares)       6,000,000 2,000,000    
Number of shares released (in shares)       1,000,000      
Aggregate Intrinsic Value, Outstanding and unvested at end of year | $       $ 181      
2013 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares reserved for issuance (in shares)       45,000,000      
Remaining shares available for future issuance (in shares)       28,000,000      
PRUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted-average fair value per grant (in dollars per share) | $ / shares       $ 19.99 $ 27.10 $ 26.30  
Total fair value of restricted stock vested and released | $       $ 14 $ 9 $ 23  
Total unrecognized compensation cost adjusted for estimated forfeitures | $       $ 172      
Weighted-average period in years over which stock based compensation cost is expected to be recognized (in years)       1 year 1 day      
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total unrecognized compensation cost adjusted for estimated forfeitures | $       $ 147      
Weighted-average period in years over which stock based compensation cost is expected to be recognized (in years)       1 year 8 months      
PCSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of share granted (in shares)       0      
Number of unvested shares (in shares)       0      
LifeLock | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed, Fair Value | $             $ 91
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed             3,100,000
LifeLock | Employee Stock Option, Unvested [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed, Fair Value | $             $ 61
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed             4,100,000
Blue Coat, Inc.              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Number of Equity Incentive Plans Assumed | plan 2            
Blue Coat, Inc. | Performance Shares and Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed, Fair Value | $ $ 162            
Blue Coat, Inc. | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed 4,800,000            
Blue Coat, Inc. | PRUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed 3,000,000            
Blue Coat, Inc. | Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed, Fair Value | $ $ 265            
Blue Coat, Inc. | Employee Stock Option, Vested [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed 7,500,000            
Blue Coat, Inc. | Employee Stock Option, Unvested [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed 12,500,000            
Blue Coat, Inc. | Chief Executive Officer [Member] | Performance Shares and Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Share-based Compensation Arrangement, Shares Assumed, Fair Value | $ $ 46            
Blue Coat, Inc. | Chief Executive Officer [Member] | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 1,300,000            
Award vesting period (in years) 3 years            
Blue Coat, Inc. | Chief Executive Officer [Member] | Performance Based Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 1,000,000            
Award vesting period (in years) 2 years            
Blue Coat, Inc. | Blue Coat, Inc. | Chief Executive Officer [Member] | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 3,900,000            
Aggregate Intrinsic Value, Outstanding and unvested at end of year | $ $ 53            
Stock Granted, Value, Share-based Compensation, Gross | $       $ 50