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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions |  | 3 Months Ended | 6 Months Ended | 185 Months Ended
--- | --- | --- | --- | ---
Nov. 14, 2018 | Oct. 26, 2018 | Oct. 27, 2017 | Oct. 26, 2018 | Oct. 27, 2017 | Oct. 26, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense related to equity awards |  | $ 337,000,000 |  | $ 337,000,000 |  | $ 337,000,000
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 |  | $ 13,600,000,000 |  | $ 13,600,000,000 |  | 13,600,000,000
Allocation of purchase price of share repurchases |  |  |  | $ 1,061,000,000 |  | $ 10,700,000,000
Repurchase of common stock, shares |  |  |  | 14 |  | 298
Average price of common stock repurchased under repurchase program |  |  |  | $ 77.94 |  | $ 35.87
Cash dividends declared, per common share |  | $ 0.40 | $ 0.20 | $ 0.80 | $ 0.40 |
Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash dividends declared, per common share | $ 0.40 |  |  |  |  |
Cash dividend payable date | Jan. 23, 2019 |  |  |  |  |
Cash dividend record date | Jan. 04, 2019 |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Allocation of purchase price of share repurchases |  |  |  | $ 597,000,000 |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Allocation of purchase price of share repurchases |  |  |  | $ 464,000,000 |  |
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 Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Period |  |  |  | 3 years |  |
RSUs grant date fair value |  | $ 23,000,000 |  | $ 23,000,000 |  | $ 23,000,000
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 2019 through 2021. |  |

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