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Goodwill and Intangible Assets (Details 2) - USD ($)
12 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Intangible assets      
Goodwill impairment loss $ 0 $ 88,000,000 $ 0
Goodwill 18,306,000,000 17,537,000,000 17,516,000,000
Intangible assets, gross 1,987,000,000 1,498,000,000  
Amortizable intangible assets, accumulated amortization (859,000,000) (709,000,000)  
Amortizable intangible assets, net 987,000,000    
Total Intangible Assets- Net 1,128,000,000 789,000,000  
Gross intangible assets acquired 606,000,000 41,000,000  
Amount of fully amortized intangible assets 117,000,000 106,000,000  
In-process research and development      
Intangible assets      
Amortizable intangible assets, gross 141,000,000 18,000,000  
Amortizable intangible assets, net 141,000,000 18,000,000  
Customer contracts, customer lists and distribution agreements      
Intangible assets      
Amortizable intangible assets, gross 312,000,000 272,000,000  
Amortizable intangible assets, accumulated amortization (96,000,000) (142,000,000)  
Amortizable intangible assets, net $ 216,000,000 130,000,000  
Weighted-Average Remaining Useful Lives 3 years    
Developed and core technology and patents      
Intangible assets      
Amortizable intangible assets, gross $ 1,371,000,000 1,121,000,000  
Amortizable intangible assets, accumulated amortization (719,000,000) (525,000,000)  
Amortizable intangible assets, net $ 652,000,000 596,000,000  
Weighted-Average Remaining Useful Lives 4 years    
Developed and core technology and patents | In-process research and development      
Intangible assets      
Reclassified $ 18,000,000 57,000,000  
Trade name and trade marks      
Intangible assets      
Amortizable intangible assets, gross 163,000,000 87,000,000  
Amortizable intangible assets, accumulated amortization (44,000,000) (42,000,000)  
Amortizable intangible assets, net $ 119,000,000 45,000,000  
Weighted-Average Remaining Useful Lives 5 years    
Hybrid IT      
Intangible assets      
Goodwill impairment loss   0  
Goodwill $ 16,248,000,000 15,479,000,000 $ 15,373,000,000
CMS Reporting Unit      
Intangible assets      
Goodwill impairment loss   88,000,000  
Goodwill   $ 0