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Segment Information - Reconciliation of Segment Assets to Consolidated Assets (Details) - USD ($)
$ in Millions
Oct. 31, 2018
Oct. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 34,622 $ 32,913
Total segments | Personal Systems    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 13,447 12,156
Total segments | Printing    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 13,706 10,548
Total segments | Corporate Investments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 5 3
Corporate and unallocated assets    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 7,464 $ 10,206