Goodwill and Purchased Intangible Assets - Schedule of Amortization of Purchased Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 01, 2021	Apr. 25, 2020	May 01, 2021	Apr. 25, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	$ 61	$ 34	$ 136	$ 108
Total
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	248	197	649	602
Cost of sales
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	187	163	513	494
Operating expenses
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	$ 61	$ 34	$ 136	$ 108