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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 |  |

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