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Acquisitions and Divestitures - Additional Information (Details) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 25, 2020 USD ($) | Jul. 27, 2019 USD ($) acquisition | Jul. 28, 2018 USD ($) divestiture | Jul. 29, 2017 USD ($) acquisition | Oct. 28, 2018 USD ($)
Divestiture [Line Items] |  |  |  |  |
Number of business combinations (acquisition) | acquisition |  | 5 |  | 7 |
Cash and cash equivalents acquired |  | $ 100 | $ 187 |  |
Total purchase consideration |  | 2,686 | 3,218 | $ 3,600 |
General and Administrative Expense |  |  |  |  |
Divestiture [Line Items] |  |  |  |  |
Total transaction costs |  | $ 21 | $ 41 | $ 10 |
Forecast | Acacia Communications, Inc. |  |  |  |  |
Divestiture [Line Items] |  |  |  |  |
Cash payments for acquisition | $ 2,600 |  |  |  |
Disposed of by sale |  |  |  |  |
Divestiture [Line Items] |  |  |  |  |
Number of divestitures (divestiture) | divestiture |  |  | 2 |  |
Disposed of by sale | Service Provider Video |  |  |  |  |
Divestiture [Line Items] |  |  |  |  |
Disposal group, tangible assets |  |  |  |  | $ 160
Disposal group, goodwill and intangible assets |  |  |  |  | 340
Disposal group, liabilities |  |  |  |  | $ 200

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