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Stockholders' Equity - Additional Information (Detail)
$ / shares in Units, shares in Millions
3 Months Ended 6 Months Ended 150 Months Ended
Nov. 18, 2015
$ / shares
Oct. 30, 2015
USD ($)
$ / shares
Oct. 24, 2014
$ / shares
Oct. 30, 2015
USD ($)
$ / shares
shares
Oct. 24, 2014
USD ($)
$ / shares
Oct. 30, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense related to equity awards   $ 381,000,000   $ 381,000,000   $ 381,000,000
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years       2 years    
Stock repurchase program, authorized amount   $ 9,600,000,000   $ 9,600,000,000   $ 9,600,000,000
Allocation of purchase price of share repurchases       $ 613,000,000    
Repurchase of common stock, shares | shares       19   233
Average price of common stock repurchased under repurchase program | $ / shares       $ 31.70   $ 33.33
Aggregate purchase price of common stock authorized under repurchase program       $ 613,000,000 $ 719,000,000 $ 7,800,000,000
Cash dividends declared, per common share | $ / shares   $ 0.180 $ 0.165 $ 0.360 $ 0.330  
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       $ 499,000,000    
Retained Earnings            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocation of purchase price of share repurchases       $ 114,000,000    
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   $ 20,000,000   $ 20,000,000   $ 20,000,000
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       6    
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