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Employee Benefit Plans - Employee Stock Purchase Plan (Details) - Employee stock purchase plan shares in Millions | 12 Months Ended
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Jul. 31, 2021 period shares | Jul. 25, 2020 shares | Jul. 27, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance (in shares) | 721 |  |
Consecutive offering period | 24 months |  |
Number of purchase periods | period | 4 |  |
Purchase period | 6 months |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date | 15.00% |  |
Shares issued under employee purchase plan, shares (in shares) | 17 | 18 | 19
Shares reserved for issuance (in shares) | 125 |  |

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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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