Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 29, 2022	Jan. 23, 2021	Jan. 29, 2022	Jan. 23, 2021	Jul. 31, 2021
Disaggregation of Revenue [Line Items]
Allowance for future sales returns	$ 46		$ 46		$ 55
Payment terms			30 days
Accounts receivable, net	6,003		$ 6,003		5,766
Deferred revenue	22,313		22,313		22,164
Revenue recognized	3,300		7,400
Total deferred sales commissions	999		999		967
Amortization of sales commissions, expense	147	$ 129	317	$ 252
Software and Service Agreements
Disaggregation of Revenue [Line Items]
Contract assets, net of allowances	$ 1,400		$ 1,400		$ 1,400