Segment Information and Major Customers - Summary of Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 01, 2021	Apr. 25, 2020	May 01, 2021	Apr. 25, 2020
Segment Reporting Information [Line Items]
Revenue	$ 12,803	$ 11,983	$ 36,692	$ 37,147
Gross margin	8,185	7,771	23,550	23,999
Operating segments
Segment Reporting Information [Line Items]
Gross margin	8,445	7,986	24,303	24,636
Operating segments | Americas
Segment Reporting Information [Line Items]
Revenue	7,262	7,116	21,430	22,106
Gross margin	4,831	4,828	14,383	14,836
Operating segments | EMEA
Segment Reporting Information [Line Items]
Revenue	3,483	3,136	9,654	9,553
Gross margin	2,283	2,061	6,322	6,289
Operating segments | APJC
Segment Reporting Information [Line Items]
Revenue	2,057	1,730	5,608	5,489
Gross margin	1,331	1,098	3,599	3,511
Unallocated corporate items
Segment Reporting Information [Line Items]
Gross margin	$ (260)	$ (215)	$ (753)	$ (637)