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Stock Purchase and Award Plans , Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Apr. 29, 2016
Apr. 24, 2015
Apr. 25, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 375 $ 439 $ 145
Acquisition-related items [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 58 189 0
Stock options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Vesting period 4 years    
Stock-based compensation expense $ 206 140 34
Unrecognized compensation expense related to outstanding stock options $ 303    
Weighted average period over which unrecognized compensation is expected to be recognized 2 years 1 month    
Restricted stock awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Stock-based compensation expense $ 148 284 98
Weighted average period over which unrecognized compensation is expected to be recognized 2 years 6 months 12 days    
Unrecognized compensation expense related to restricted stock awards $ 278    
Performance-based restricted stock awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Employees stock purchase plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
The discount rate from market value on purchase date 15.00%    
Minimum employee contribution rate 2.00%    
Maximum employee contribution rate 10.00%    
Purchase price of common stock as a percentage of its fair market value 85.00%    
Shares purchased by employees (in shares) 2    
Average purchase price (in dollars per share) $ 61.66    
Amount withheld to purchase common stock $ 12    
Shares available for future purchase (in shares) 20    
Stock-based compensation expense $ 21 $ 15 $ 13
2013 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants (in shares) 27