Acquisitions and Divestitures (Summary of Allocation of Total Purchase Consideration) (Details) $ in Millions	9 Months Ended
	Apr. 27, 2019 USD ($) acquisition
Business Acquisition [Line Items]
Purchase Consideration	$ 2,686
Net Tangible Assets Acquired (Liabilities Assumed)	(74)
Purchased Intangible Assets	672
Goodwill	$ 2,088
Number of business combinations (acquisition) | acquisition	5
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
Others (three in total)
Business Acquisition [Line Items]
Purchase Consideration	65
Net Tangible Assets Acquired (Liabilities Assumed)	2
Purchased Intangible Assets	11
Goodwill	$ 52
Number of business combinations (acquisition) | acquisition	3