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Business Combinations, Definite-Lived Intangible Assets, Net and Goodwill (Business Combination) (Details)
3 Months Ended
Jul. 31, 2020
USD ($)
acquisition
May 01, 2020
USD ($)
Jan. 31, 2020
USD ($)
Business Acquisition [Line Items]      
Goodwill $ 9,547,000,000   $ 9,329,000,000
Datrium, Inc.      
Business Acquisition [Line Items]      
Total purchase price 137,000,000    
Intangible assets 25,000,000    
Goodwill 91,000,000    
Goodwill expected to be deductible for tax purposes $ 0    
Datrium, Inc. | Completed Technology | Minimum      
Business Acquisition [Line Items]      
Useful lives (in years) 3 years    
Datrium, Inc. | Completed Technology | Maximum      
Business Acquisition [Line Items]      
Useful lives (in years) 5 years    
Lastline, Inc.      
Business Acquisition [Line Items]      
Total purchase price $ 114,000,000    
Intangible assets 29,000,000    
Goodwill 86,000,000    
Goodwill expected to be deductible for tax purposes $ 0    
Lastline, Inc. | Completed Technology | Minimum      
Business Acquisition [Line Items]      
Useful lives (in years) 1 year    
Lastline, Inc. | Completed Technology | Maximum      
Business Acquisition [Line Items]      
Useful lives (in years) 4 years    
Nyansa, Inc.      
Business Acquisition [Line Items]      
Total purchase price   $ 38,000,000  
Intangible assets   14,000,000  
Goodwill   24,000,000  
Goodwill expected to be deductible for tax purposes   $ 0  
Nyansa, Inc. | Completed Technology | Minimum      
Business Acquisition [Line Items]      
Useful lives (in years)   1 year  
Nyansa, Inc. | Completed Technology | Maximum      
Business Acquisition [Line Items]      
Useful lives (in years)   4 years  
Series of Individually Immaterial Business Acquisitions      
Business Acquisition [Line Items]      
Total purchase price $ 40,000,000    
Intangible assets 31,000,000    
Goodwill 16,000,000    
Goodwill expected to be deductible for tax purposes $ 24,000,000    
Number of other acquisitions | acquisition 2    
Series of Individually Immaterial Business Acquisitions | Completed Technology | Minimum      
Business Acquisition [Line Items]      
Useful lives (in years) 1 year    
Series of Individually Immaterial Business Acquisitions | Completed Technology | Maximum      
Business Acquisition [Line Items]      
Useful lives (in years) 5 years