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Acquisitions Finite Intangible Assets Acquired (Details) - USD ($)
$ in Millions
 12 Months Ended
Nov. 17, 2017
Feb. 01, 2016
Nov. 04, 2018
Oct. 29, 2017
Trade names        
Acquired Finite-Lived Intangible Assets [Line Items]        
Estimated useful life     12 years 13 years
Other        
Acquired Finite-Lived Intangible Assets [Line Items]        
Estimated useful life     10 years 10 years
BRCM [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets   $ 12,858    
Intangible assets, net of assets held for sale   14,808    
Intangible assets acquired included in assets held for sale   15,128    
BRCM [Member] | Developed technology        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets   $ 9,010    
Estimated useful life   6 years    
BRCM [Member] | Customer Contracts        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets   $ 2,703    
Estimated useful life   2 years    
BRCM [Member] | Order backlog        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets   $ 750    
Estimated useful life   1 year    
BRCM [Member] | Trade names        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets   $ 350    
Estimated useful life   17 years    
BRCM [Member] | Other        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets   $ 45    
Estimated useful life   16 years    
BRCM [Member] | Discontinued Operations, Held-for-sale [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets   $ 320    
Brocade Communications Systems, Inc. [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets $ 3,241      
Intangible assets, net of assets held for sale 3,396      
Brocade Communications Systems, Inc. [Member] | Developed technology        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets $ 2,925      
Estimated useful life 10 years      
Brocade Communications Systems, Inc. [Member] | Customer Contracts        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets $ 255      
Estimated useful life 11 years      
Brocade Communications Systems, Inc. [Member] | Trade name and other [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Total identified finite-lived intangible assets $ 61      
Estimated useful life 6 years      
In-process research and development [Member] | BRCM [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets Acquired   $ 1,950    
In-process research and development [Member] | Brocade Communications Systems, Inc. [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets Acquired $ 155      
Directors [Member] | In-process research and development [Member] | Brocade Communications Systems, Inc. [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets Acquired $ 64      
Percentage of completion 72.00%      
Estimated costs to complete $ 45      
Year of completion 2019      
Switches [Member] | In-process research and development [Member] | Brocade Communications Systems, Inc. [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets Acquired $ 50      
Percentage of completion 81.00%      
Estimated costs to complete $ 21      
Year of completion 2018      
Embedded [Member] | In-process research and development [Member] | Brocade Communications Systems, Inc. [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets Acquired $ 31      
Percentage of completion 74.00%      
Estimated costs to complete $ 22      
Year of completion 2019      
Networking software [Member] | In-process research and development [Member] | Brocade Communications Systems, Inc. [Member]        
Acquired Finite-Lived Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets Acquired $ 10      
Percentage of completion 73.00%      
Estimated costs to complete $ 27      
Year of completion 2018