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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 195 Months Ended |
--- | --- | --- | --- | ---
Aug. 14, 2019 | Jul. 26, 2019 | Jul. 27, 2018 | Jul. 26, 2019 | Apr. 26, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to equity awards |  | $ 383,000,000 |  | $ 383,000,000 |
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years |  | 2 years 6 months |  |  |
Stock repurchase program, authorized amount |  | $ 13,600,000,000 |  | $ 13,600,000,000 |
Allocation of purchase price of share repurchases |  | $ 250,000,000 | $ 500,000,000 |  |
Repurchase of common stock, shares |  | 4,000,000 |  | 317,000,000 |
Average price of common stock repurchased under repurchase program |  | $ 64.87 |  | $ 37.80 |
Aggregate purchase price of common stock authorized under repurchase program |  | $ 250,000,000 | $ 500,000,000 | $ 12,000,000,000.0 |
Cash dividends declared, per common share |  | $ 0.48 | $ 0.40 |  |
Other income, net |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Realized gains from sale of available-for-sale securities |  | $ 14,000,000 |  |  |
Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cash dividends declared, per common share | $ 0.48 |  |  |  |
Cash dividend payable date | Oct. 23, 2019 |  |  |  |
Cash dividend record date | Oct. 04, 2019 |  |  |  |
Additional Paid-in Capital |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocation of purchase price of share repurchases |  | 141,000,000 |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocation of purchase price of share repurchases |  | $ 109,000,000 | $ 223,000,000 |  |
Performance Based Restricted Stock Unit |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
RSUs grant date fair value |  | $ 18,000,000 |  | $ 18,000,000 |
Vesting period, description |  | For the remaining PBRSUs granted, the number of shares issued will depend upon our achievement against a cumulative Adjusted Operating Income (AOI) target, as defined in the grant agreements, for the three year period from fiscal 2020 through 2022. |  |  |
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] |  |  |  |  |
Number of options outstanding |  | 1,000,000 |  | 1,000,000 | 1,000,000
Percentage of Common stock issued to settle PBRSUs of target shares granted |  | 200.00% |  |  |

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