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Goodwill and Intangible Assets (Details) - USD ($)
 12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Goodwill      
Balance at beginning of period $ 17,516,000,000 $ 16,090,000,000  
Goodwill acquired during the period 104,000,000 1,427,000,000  
Impairment of goodwill (88,000,000)    
Changes due to foreign currency 6,000,000 1,000,000  
Goodwill adjustments (1,000,000) (2,000,000)  
Balance at end of period 17,537,000,000 17,516,000,000 $ 16,090,000,000
CMS Reporting Unit [Member]      
Goodwill      
Impairment of goodwill (88,000,000) 0 0
Balance at end of period 0    
Hybrid IT      
Goodwill      
Balance at beginning of period 15,454,000,000 14,045,000,000  
Goodwill acquired during the period 101,000,000 1,410,000,000  
Impairment of goodwill (88,000,000)    
Changes due to foreign currency 6,000,000 1,000,000  
Goodwill adjustments (1,000,000) (2,000,000)  
Balance at end of period 15,472,000,000 15,454,000,000 14,045,000,000
Intelligent Edge      
Goodwill      
Balance at beginning of period 1,918,000,000 1,901,000,000  
Goodwill acquired during the period 3,000,000 17,000,000  
Impairment of goodwill 0    
Changes due to foreign currency 0 0  
Goodwill adjustments 0 0  
Balance at end of period 1,921,000,000 1,918,000,000 1,901,000,000
Financial Services      
Goodwill      
Balance at beginning of period 144,000,000 144,000,000  
Goodwill acquired during the period 0 0  
Impairment of goodwill 0    
Changes due to foreign currency 0 0  
Goodwill adjustments 0 0  
Balance at end of period $ 144,000,000 $ 144,000,000 $ 144,000,000