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Balance Sheet and Other Details - Remaining Performance Obligations (Details) - USD ($)
$ in Millions
Oct. 30, 2021
Jul. 31, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 30,135 $ 30,893
Deferred revenue 22,072 22,164
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-08-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation   $ 16,289
Remaining performance obligation, expected timing of satisfaction, period   1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-31    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 15,941  
Remaining performance obligation, expected timing of satisfaction, period 12 months  
Remaining performance obligation, percentage 53.00%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-31    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation   $ 14,604
Remaining performance obligation, expected timing of satisfaction, period  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-30    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 14,194  
Remaining performance obligation, expected timing of satisfaction, period  
Unbilled Contract Revenue    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation $ 8,100 $ 8,700
Product    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation 13,384 13,270
Deferred revenue 9,681 9,416
Service    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation 16,751 17,623
Deferred revenue $ 12,391 $ 12,748