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Employee Benefit Plans - Additional Information (Details) $ in Billions | 3 Months Ended | 9 Months Ended
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May 01, 2021 USD ($) stock_incentive_plan shares | Apr. 25, 2020 shares | May 01, 2021 USD ($) period stock_incentive_plan shares | Apr. 25, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of stock incentive plans (stock incentive plan) | stock_incentive_plan | 1 |  | 1 |
Total compensation cost related to unvested share-based awards | $ | $ 3.6 |  | $ 3.6 |
Expected period of recognition of compensation cost |  |  | 2 years 6 months |
Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance (in shares) | 721,000,000 |  | 721,000,000 |
Consecutive offering period |  |  | 24 months |
Number of purchase periods | period |  |  | 4 |
Purchase period |  |  | 6 months |
ESPP discount percentage from market price, beginning of purchase period |  |  | 15.00% |
Shares issued under employee purchase plan (in shares) | 0 | 0 | 8,000,000 | 9,000,000
Shares reserved for issuance (in shares) | 133,000,000 |  | 133,000,000 |
2005 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance (in shares) | 790,000,000 |  | 790,000,000 |
Reduction in shares available for issuance (in shares) | 1.5 |  | 1.5 |
Shares authorized for future grant (in shares) | 257,000,000 |  | 257,000,000 |

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