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Revenue - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020
Disaggregation of Revenue [Line Items]
Payment terms	30 days
Accounts receivable, net	$ 5,766	$ 5,472
Deferred revenue	22,164	20,446
Revenue recognized	11,300
Total deferred sales commissions	967	732
Amortization of sales commissions, expense	532	477
Software and Service Agreements
Disaggregation of Revenue [Line Items]
Contract assets, net of allowances	$ 1,400	$ 1,200

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Revenue From Contract With Customer, Payment Terms

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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-Name Accounting Standards Codification
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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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