Segment Information and Major Customers - Summary of Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 23, 2021	Jan. 25, 2020	Jan. 23, 2021	Jan. 25, 2020
Segment Reporting Information [Line Items]
Revenue	$ 11,960	$ 12,005	$ 23,889	$ 25,164
Gross margin	7,784	7,764	15,365	16,228
Operating segments
Segment Reporting Information [Line Items]
Gross margin	8,005	7,974	15,858	16,650
Operating segments | Americas
Segment Reporting Information [Line Items]
Revenue	6,969	7,013	14,168	14,990
Gross margin	4,705	4,692	9,552	10,008
Operating segments | EMEA
Segment Reporting Information [Line Items]
Revenue	3,207	3,134	6,171	6,417
Gross margin	2,145	2,062	4,038	4,229
Operating segments | APJC
Segment Reporting Information [Line Items]
Revenue	1,784	1,859	3,551	3,758
Gross margin	1,155	1,219	2,268	2,413
Unallocated corporate items
Segment Reporting Information [Line Items]
Gross margin	$ (221)	$ (210)	$ (493)	$ (422)