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Acquisitions and Divestitures - Summary of Allocation of Total Purchase Consideration (Details) $ in Millions	12 Months Ended
	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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