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Acquisitions (Purchase Price Allocation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Nov. 03, 2019
Nov. 04, 2018
Oct. 29, 2017
Dec. 31, 2018
Nov. 05, 2018
Dec. 01, 2017
Nov. 17, 2017
Business Acquisition [Line Items]              
Goodwill $ 36,714 $ 26,913 $ 24,706        
Tax indemnification liability 116 116          
Assets held-for-sale included in current assets         $ 80    
Proceeds from sale of assets held-for-sale 88 239 $ 441        
Veracode Inc.              
Business Acquisition [Line Items]              
Consideration for disposal of business       $ 950      
Ruckus Wireless and ICX Switch              
Business Acquisition [Line Items]              
Consideration for disposal of business           $ 800  
Tax indemnification liability           $ 116  
CA Technologies, Inc.              
Business Acquisition [Line Items]              
Current assets         1,665    
Goodwill         9,796    
Intangible assets         12,045    
Other long-term assets         240    
Total assets acquired         23,746    
Other current liabilities         (1,966)    
Long-term debt         (2,255)    
Other long-term liabilities         (3,431)    
Total liabilities assumed         (7,652)    
Fair value of net assets acquired         $ 16,094    
Net revenue 3,377            
CA Technologies, Inc. | Selling, general and administrative expense              
Business Acquisition [Line Items]              
Transaction costs $ 73            
Brocade Communications Systems, Inc.              
Business Acquisition [Line Items]              
Current assets             $ 1,297
Goodwill             2,187
Intangible assets             3,396
Other long-term assets             82
Total assets acquired             6,962
Current portion of long-term debt             (856)
Other current liabilities             (374)
Long-term debt             (38)
Other long-term liabilities             (906)
Total liabilities assumed             (2,174)
Fair value of net assets acquired             $ 4,788
Proceeds from sale of assets held-for-sale   224          
Net revenue   1,780          
Brocade Communications Systems, Inc. | Selling, general and administrative expense              
Business Acquisition [Line Items]              
Transaction costs   $ 29