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Stock Purchase and Award Plans , Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Apr. 24, 2015
Apr. 24, 2015
Apr. 25, 2014
Apr. 26, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 439 $ 145 $ 152
Acquisition-related items        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 189 0 0
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period   10 years    
Vesting period   4 years    
Unrecognized compensation expense related to outstanding stock options $ 403 $ 403    
Weighted average period over which unrecognized compensation is expected to be recognized   2 years    
Stock-based compensation expense   $ 140 34 44
Stock options | Acquisition-related items | Covidien plc        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 26      
Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Unrecognized compensation expense related to restricted stock awards $ 252 $ 252    
Weighted average period over which unrecognized compensation is expected to be recognized   2 years 2 months 12 days    
Stock-based compensation expense   $ 284 98 96
Performance-based restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Employees stock purchase plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum employee contribution rate 10.00% 10.00%    
Purchase price of common stock as a percentage of its fair market value   85.00%    
Shares purchased by employees (in shares)   1    
Average purchase price (in dollars per share)   $ 57.66    
Amount withheld to purchase common stock $ 11 $ 11    
Shares available for future purchase (in shares) 22 22    
The discount rate from market value on purchase date   15.00%    
Stock-based compensation expense   $ 15 $ 13 $ 12
Restricted stock units | Acquisition-related items | Covidien plc        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated stock-based compensation expense $ 91      
Performance share units | Acquisition-related items | Covidien plc        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated stock-based compensation expense $ 72      
2013 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grants (in shares) 41 41