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Acquisitions and Divestitures (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2016
USD ($)
$ / shares
May 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Apr. 30, 2016
USD ($)
₨ / shares
May 31, 2015
USD ($)
Oct. 31, 2016
USD ($)
Jul. 31, 2016
Oct. 31, 2016
USD ($)
item
business_acquired
Oct. 31, 2015
USD ($)
item
Oct. 31, 2014
USD ($)
business_acquired
Divestitures                    
Number of divestitures | item                 4  
Proceeds from business divestitures               $ 3,342 $ 140 $ 6
Gain on disposal               2,420 0 0
Entity ownership of HP China businesses (as a percent)             49.00%      
Gain on divestiture               $ 2,420 0 $ 0
Acquisitions                    
Number of acquisitions | business_acquired               2   2
Goodwill                   $ 12
Total fair value of consideration                   55
Goodwill           $ 24,178   $ 24,178 $ 27,261 25,960
Intangible assets                   25
Trilead Ag                    
Acquisitions                    
Goodwill           12   12    
Intangible assets           $ 11   11    
SGI                    
Acquisitions                    
Acquisition price ($ per share) | $ / shares $ 7.75                  
Total fair value of consideration $ 275                  
Acquisitions                    
Acquisitions                    
Number of acquisitions | item                 5  
Aggregate purchase price allocation                    
Acquisitions                    
Total fair value of consideration                 $ 3,071  
Goodwill                 1,987  
Intangible assets                 704  
Aggregate purchase price allocation | In-process research and development                    
Acquisitions                    
Intangible assets                 159  
Aruba                    
Acquisitions                    
Total fair value of consideration         $ 2,800          
Goodwill         1,800          
Intangible assets         $ 643          
Weighted-average useful life         6 years          
Aruba | In-process research and development                    
Acquisitions                    
Intangible assets         $ 153          
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff | H3C                    
Divestitures                    
Earnings               $ 182 $ 286 $ 406
Ownership           49.00%   49.00%    
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff | H3C | HP China businesses                    
Divestitures                    
Entity ownership of HP China businesses (as a percent)   100.00%                
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, 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 | Disposal Groups Closed During First Half Fy2016                    
Divestitures                    
Number of divestitures | item               5    
Consideration received           $ 3,400   $ 3,400    
Proceeds from business divestitures           $ 25        
Disposed of by sale | MphasiS | MphasiS                    
Divestitures                    
Consideration received     $ 824 ₨ 824            
Gain on divestiture     $ 253              
Enterprise Group                    
Acquisitions                    
Adjustments               $ 260