Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 01, 2021	Apr. 25, 2020	May 01, 2021	Apr. 25, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 12,803	$ 11,983	$ 36,692	$ 37,147
Product
Disaggregation of Revenue [Line Items]
Revenue	9,139	8,597	26,298	27,146
Infrastructure Platforms
Disaggregation of Revenue [Line Items]
Revenue	6,832	6,447	19,564	20,566
Applications
Disaggregation of Revenue [Line Items]
Revenue	1,426	1,363	4,160	4,211
Security
Disaggregation of Revenue [Line Items]
Revenue	876	778	2,559	2,343
Other Products
Disaggregation of Revenue [Line Items]
Revenue	6	9	15	27
Services
Disaggregation of Revenue [Line Items]
Revenue	$ 3,664	$ 3,386	$ 10,394	$ 10,001