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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended | 201 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 12, 2020 | Jan. 24, 2020 | Oct. 25, 2019 | Jan. 25, 2019 | Jan. 24, 2020 | Jan. 25, 2019 | Jan. 24, 2020 | Apr. 26, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation expense related to equity awards |  | $ 315,000,000 |  |  | $ 315,000,000 |  | $ 315,000,000 |
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years |  |  |  |  | 2 years 1 month 6 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 |  | $ 500,000,000 |  | $ 550,000,000 | $ 1,250,000,000 | $ 1,611,000,000 |  |
Repurchase of common stock, shares |  |  |  |  | 22,000,000 |  | 335,000,000 |
Average price of common stock repurchased under repurchase program |  |  |  |  | $ 57.36 |  | $ 38.76 |
Aggregate purchase price of common stock authorized under repurchase program |  |  |  |  | $ 1,250,000,000 | $ 1,611,000,000 | $ 13,000,000,000.0 |
Cash dividends declared, per common share |  | $ 0.48 |  | $ 0.40 | $ 1.44 | $ 1.20 |  |
Other income, net |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Realized gains from sale of available-for-sale debt 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 | Apr. 22, 2020 |  |  |  |  |  |  |
Cash dividend record date | Apr. 03, 2020 |  |  |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Allocation of purchase price of share repurchases |  |  |  |  | 621,000,000 |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Allocation of purchase price of share repurchases |  | $ 277,000,000 |  | $ 249,000,000 | $ 629,000,000 | $ 713,000,000 |  |
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 |  | $ 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 | 1,000,000
Percentage of Common stock issued to settle PBRSUs of target shares granted |  |  |  |  | 200.00% |  |  |
1999 Stock Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share based compensation arrangement by share based payment award extended expiration period |  |  | 10 years |  |  |  |  |

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