Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 30, 2021	Oct. 24, 2020	Jul. 31, 2021
Disaggregation of Revenue [Line Items]
Allowance for future sales returns	$ 49		$ 55
Payment terms	30 days
Accounts receivable, net	$ 5,306		5,766
Deferred revenue	22,072		22,164
Revenue recognized	4,100
Total deferred sales commissions	994		967
Amortization of sales commissions, expense	187	$ 123
Software and Service Agreements
Disaggregation of Revenue [Line Items]
Contract assets, net of allowances	$ 1,400		$ 1,400