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Acquisitions and Divestitures (Details)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 17, 2017
USD ($)
Feb. 17, 2017
USD ($)
Nov. 01, 2016
USD ($)
May 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2016
₨ / shares
Oct. 31, 2018
USD ($)
business_acquired
Oct. 31, 2017
USD ($)
business_acquired
Oct. 31, 2016
USD ($)
divestiture
Sep. 01, 2016
USD ($)
Acquisitions                    
Number of acquisitions | business_acquired             3 6    
Goodwill             $ 17,537 $ 17,516 $ 16,090  
Divestitures                    
Gain on disposal             0 0 2,420  
Gain on divestiture             $ 0 $ 0 2,420  
Nimble Storage                    
Acquisitions                    
Total fair value of consideration $ 1,200                  
Goodwill 755                  
Intangible assets $ 291                  
Weighted-average useful life 5 years                  
SimpliVity                    
Acquisitions                    
Total fair value of consideration   $ 651                
Goodwill   442                
Intangible assets   $ 118                
Weighted-average useful life   5 years                
SGI                    
Acquisitions                    
Total fair value of consideration     $ 349              
Goodwill     75              
Intangible assets     $ 150              
Weighted-average useful life     5 years              
Spinoff | H3C                    
Divestitures                    
Earnings                 $ 182  
Ownership             49.00%      
Spinoff | H3C | HP China businesses                    
Divestitures                    
Entity ownership of China businesses (as a percent)       100.00%            
Spinoff | Tsinghua Holdings Subsidiary | H3C                    
Divestitures                    
Consideration received       $ 2,600            
Interest acquired (as a percent)       51.00%            
Gain on disposal       $ 2,200            
Disposal Group, Held-for-sale, Not Discontinued Operations | MphasiS | MphasiS                    
Divestitures                    
Proceeds (INR per share) | ₨ / shares           ₨ 430        
Disposed of by sale                    
Divestitures                    
Number of divestitures | divestiture                 3  
Consideration received                 $ 3,000  
Disposed of by sale | MphasiS | MphasiS                    
Divestitures                    
Consideration received                   $ 824
Gain on divestiture         $ 253          
In-process research and development | Nimble Storage                    
Acquisitions                    
Intangible assets $ 31                  
In-process research and development | SimpliVity                    
Acquisitions                    
Intangible assets   $ 24                
In-process research and development | SGI                    
Acquisitions                    
Intangible assets     $ 30