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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 159 Months Ended
Aug. 17, 2016
Jul. 29, 2016
Jul. 31, 2015
Jul. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense related to equity awards   $ 368,000,000   $ 368,000,000
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years   2 years 3 months 18 days    
Stock repurchase program, authorized amount   $ 9,600,000,000   $ 9,600,000,000
Allocation of purchase price of share repurchases   $ 175,000,000    
Repurchase of common stock, shares   7   255
Average price of common stock repurchased under repurchase program   $ 24.20   $ 32.60
Aggregate purchase price of common stock authorized under repurchase program   $ 175,000,000 $ 430,000,000 $ 8,300,000,000
Cash dividends declared, per common share   $ 0.190 $ 0.180  
Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash dividends declared, per common share $ 0.19      
Cash dividend payable date Oct. 26, 2016      
Cash dividend record date Oct. 07, 2016      
Additional Paid-in Capital        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocation of purchase price of share repurchases   $ 93,000,000    
Retained Earnings        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocation of purchase price of share repurchases   $ 82,000,000    
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of Common stock issued to settle PBRSUs of target shares granted   0.00%    
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of Common stock issued to settle PBRSUs of target shares granted   200.00%    
Performance Based Restricted Stock Unit        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs grant date fair value   $ 15,000,000   $ 15,000,000
Performance Based Restricted Stock Unit | PBRSU One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   2 years    
Performance Based Restricted Stock Unit | PBRSU Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years