Segment Information - Reconciliation of Segment Assets to Consolidated Assets (Details) - USD ($) $ in Millions	Oct. 31, 2020	Oct. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 34,681	$ 33,467
Total segments | Personal Systems
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	14,697	14,092
Total segments | Printing
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	14,170	14,309
Total segments | Corporate Investments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3	4
Corporate and unallocated assets
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 5,811	$ 5,062