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Stockholders' Equity - Additional Information (Detail)
$ / shares in Units, shares in Millions
3 Months Ended 147 Months Ended
Aug. 19, 2015
$ / shares
Jul. 31, 2015
USD ($)
$ / shares
shares
Jul. 25, 2014
USD ($)
$ / shares
Jul. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense related to equity awards   $ 426,000,000   $ 426,000,000
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years   2 years 2 months 12 days    
Stock repurchase program, authorized amount   $ 9,600,000,000   $ 9,600,000,000
Allocation of purchase price of share repurchases   $ 430,000,000    
Repurchase of common stock, shares | shares   13   227
Average price of common stock repurchased under repurchase program | $ / shares   $ 32.35   $ 33.42
Aggregate purchase price of common stock authorized under repurchase program   $ 430,000,000 $ 119,000,000 $ 7,600,000,000
Cash dividends declared, per common share | $ / shares   $ 0.180 $ 0.165  
Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash dividends declared, per common share | $ / shares $ 0.18      
Cash dividend payable date Oct. 21, 2015      
Cash dividend record date Oct. 09, 2015      
Additional Paid-in Capital        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocation of purchase price of share repurchases   $ 376,000,000    
Retained Earnings        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocation of purchase price of share repurchases   $ 54,000,000    
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    
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    
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    
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs granted, Number of Shares | shares   5    
Restricted Stock Units | RSU One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate   25.00%    
Award granted, vesting period   4 years    
Restricted Stock Units | RSU Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate   50.00%    
Award granted, vesting period   2 years    
RSUs granted, Number of Shares | shares   4