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Goodwill and Purchased Intangible Assets - Schedule of Intangible Assets Acquired Through Business Combinations (Details)
$ in Millions
 12 Months Ended
Jul. 31, 2021
USD ($)
acquisition
Jul. 25, 2020
USD ($)
acquisition
Jul. 27, 2019
acquisition
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Number of business combinations (acquisition) | acquisition 13 6 5
Total intangible assets acquired $ 2,914 $ 172  
Acacia      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Total intangible assets acquired 2,160    
Others      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Total intangible assets acquired 754    
IPR&D      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Indefinite-lived intangible assets acquired 345 $ 0  
IPR&D | Acacia      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Indefinite-lived intangible assets acquired 345    
IPR&D | Others      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Indefinite-lived intangible assets acquired 0    
TECHNOLOGY      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Weighted- Average Useful Life (in Years)   4 years 9 months 18 days  
Finite lived intangible assets acquired $ 1,835 $ 161  
TECHNOLOGY | Acacia      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Weighted- Average Useful Life (in Years) 4 years    
Finite lived intangible assets acquired $ 1,290    
TECHNOLOGY | Others      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Weighted- Average Useful Life (in Years) 4 years 3 months 18 days    
Finite lived intangible assets acquired $ 545    
CUSTOMER RELATIONSHIPS      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Weighted- Average Useful Life (in Years)   4 years 2 months 12 days  
Finite lived intangible assets acquired $ 664 $ 10  
CUSTOMER RELATIONSHIPS | Acacia      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Weighted- Average Useful Life (in Years) 4 years    
Finite lived intangible assets acquired $ 490    
CUSTOMER RELATIONSHIPS | Others      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Weighted- Average Useful Life (in Years) 4 years 7 months 6 days    
Finite lived intangible assets acquired $ 174    
OTHER      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Weighted- Average Useful Life (in Years)   1 year 6 months  
Finite lived intangible assets acquired $ 70 $ 1  
OTHER | Acacia      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Weighted- Average Useful Life (in Years) 3 years 1 month 6 days    
Finite lived intangible assets acquired $ 35    
OTHER | Others      
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items]      
Weighted- Average Useful Life (in Years) 2 years 10 months 24 days    
Finite lived intangible assets acquired $ 35