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Acquisitions and Divestitures - Summary of Allocation of Total Purchase Consideration (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jul. 27, 2019 | Jul. 28, 2018 | Jul. 29, 2017
Business Acquisition [Line Items] |  |  |
Purchase Consideration | $ 2,686 | $ 3,218 | $ 3,600
Net Tangible Assets Acquired (Liabilities Assumed) | (74) | 334 |
Purchased Intangible Assets | 672 | 867 |
Goodwill | 2,088 | 2,017 |
Duo |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration | 2,025 |  |
Net Tangible Assets Acquired (Liabilities Assumed) | (57) |  |
Purchased Intangible Assets | 342 |  |
Goodwill | 1,740 |  |
Luxtera |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration | 596 |  |
Net Tangible Assets Acquired (Liabilities Assumed) | (19) |  |
Purchased Intangible Assets | 319 |  |
Goodwill | 296 |  |
Viptela |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration |  | 497 |
Net Tangible Assets Acquired (Liabilities Assumed) |  | (18) |
Purchased Intangible Assets |  | 180 |
Goodwill |  | 335 |
Springpath |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration |  | 248 |
Net Tangible Assets Acquired (Liabilities Assumed) |  | (11) |
Purchased Intangible Assets |  | 160 |
Goodwill |  | 99 |
BroadSoft |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration |  | 2,179 |
Net Tangible Assets Acquired (Liabilities Assumed) |  | 353 |
Purchased Intangible Assets |  | 430 |
Goodwill |  | 1,396 |
Accompany |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration |  | 222 |
Net Tangible Assets Acquired (Liabilities Assumed) |  | 6 |
Purchased Intangible Assets |  | 55 |
Goodwill |  | 161 |
Others |  |  |
Business Acquisition [Line Items] |  |  |
Purchase Consideration | 65 | 72 |
Net Tangible Assets Acquired (Liabilities Assumed) | 2 | 4 |
Purchased Intangible Assets | 11 | 42 |
Goodwill | $ 52 | $ 26 |

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