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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Jul. 27, 2019
Summary Of Significant Accounting Policies [Line Items]      
Average lease term 4 years    
Loan receivables term 3 years    
Financing receivable, threshold period past due 31 days    
Financing receivable, threshold for not accruing interest 120 days    
Depreciation and amortization expenses $ 800 $ 900 $ 1,000
Allowance for future sales returns 55 79  
Advertising costs $ 268 $ 187 $ 204
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Financed service contracts term 1 year    
Channel partners revolving short-term financing payment term 60 days    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Loan receivables term 3 years    
Financed service contracts term 3 years    
Channel partners revolving short-term financing payment term 90 days    
End user lease and loan term 3 years