Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021	Jul. 31, 2021
Disaggregation of Revenue [Line Items]
Allowance for future sales returns	$ 42		$ 42		$ 55
Payment terms			30 days
Accounts receivable, net	5,783		$ 5,783		5,766
Deferred revenue	22,293		22,293		22,164
Revenue recognized	2,500		9,900
Total deferred sales commissions	1,000		1,000		967
Amortization of sales commissions, expense	175	$ 134	492	$ 386
Software and Service Agreements
Disaggregation of Revenue [Line Items]
Contract assets, net of allowances	$ 1,300		$ 1,300		$ 1,400