Segment Information - Schedule of Net Revenue by Segment and Business Unit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Segment Information
Total net revenue	$ 14,036	$ 14,003	$ 28,746	$ 28,520
Total segment net revenue
Segment Information
Total net revenue	14,037	14,004	28,751	28,521
Total segment net revenue | Personal Systems
Segment Information
Total net revenue	8,921	8,762	18,578	18,202
Total segment net revenue | Personal Systems | Notebooks
Segment Information
Total net revenue	5,099	5,153	11,018	10,748
Total segment net revenue | Personal Systems | Desktops
Segment Information
Total net revenue	2,940	2,752	5,797	5,707
Total segment net revenue | Personal Systems | Workstations
Segment Information
Total net revenue	569	538	1,131	1,081
Total segment net revenue | Personal Systems | Other
Segment Information
Total net revenue	313	319	632	666
Total segment net revenue | Printing
Segment Information
Total net revenue	5,116	5,241	10,172	10,317
Total segment net revenue | Printing | Supplies
Segment Information
Total net revenue	3,331	3,434	6,598	6,785
Total segment net revenue | Printing | Commercial Hardware
Segment Information
Total net revenue	1,179	1,145	2,269	2,182
Total segment net revenue | Printing | Consumer Hardware
Segment Information
Total net revenue	606	662	1,305	1,350
Total segment net revenue | Corporate Investments
Segment Information
Total net revenue	0	1	1	2
Other
Segment Information
Total net revenue	$ (1)	$ (1)	$ (5)	$ (1)