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Acquisitions and Divestitures - Summary of Allocation of Total Purchase Consideration (Details) $ in Millions | 12 Months Ended
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Jul. 31, 2021 USD ($) acquisition | Jul. 25, 2020 USD ($) acquisition | Jul. 27, 2019 USD ($) acquisition
Business Acquisition [Line Items] |  |  |
Number of business combinations (acquisition) | acquisition | 13 | 6 | 5
Purchase Consideration | $ 7,455 | $ 359 | $ 2,700
Net Tangible Assets Acquired (Liabilities Assumed) | 312 | (11) |
Purchased Intangible Assets | 2,914 | 172 |
Goodwill | 4,229 | $ 198 |
Acacia |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration | 4,983 |  |
Net Tangible Assets Acquired (Liabilities Assumed) | 442 |  |
Purchased Intangible Assets | 2,160 |  |
Goodwill | 2,381 |  |
Others |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration | 2,472 |  |
Net Tangible Assets Acquired (Liabilities Assumed) | (130) |  |
Purchased Intangible Assets | 754 |  |
Goodwill | $ 1,848 |  |

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