Segment Information - Schedule of Reconciliation of Segment Operating Results to HP Consolidated Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Segment Information
Net revenue	$ 15,877	$ 12,469	$ 31,523	$ 27,087
Total segment earnings from operations	1,362	826	2,683	1,691
Restructuring and other charges	(39)	(81)	(160)	(372)
Acquisition-related charges	(10)	(3)	(16)	(3)
Amortization of intangible assets	(32)	(29)	(61)	(55)
Interest and other, net	(26)	0	(51)	13
Total earnings before taxes	1,336	826	2,632	1,704
Operating segments
Segment Information
Net revenue	15,879	12,471	31,526	27,088
Total segment earnings from operations	1,626	1,086	3,355	2,489
Other
Segment Information
Net revenue	(2)	(2)	(3)	(1)
Corporate and unallocated costs and other	(108)	(84)	(244)	(196)
Stock-based compensation expense	(75)	(63)	(191)	(172)
Restructuring and other charges	(39)	(81)	(160)	(372)
Acquisition-related charges	(10)	(3)	(16)	(3)
Amortization of intangible assets	(32)	(29)	(61)	(55)
Interest and other, net	(26)	0	(51)	13
Personal Systems | Operating segments
Segment Information
Net revenue	10,555	8,313	21,158	18,205
Total segment earnings from operations	710	552	1,468	1,214
Printing | Operating segments
Segment Information
Net revenue	5,323	4,158	10,367	8,882
Total segment earnings from operations	951	548	1,949	1,302
Corporate Investments | Operating segments
Segment Information
Net revenue	1	0	1	1
Total segment earnings from operations	(35)	(14)	(62)	(27)
Notebooks | Personal Systems | Operating segments
Segment Information
Net revenue	7,489	5,083	14,855	11,057
Desktops | Personal Systems | Operating segments
Segment Information
Net revenue	2,225	2,409	4,625	5,332
Workstations | Personal Systems | Operating segments
Segment Information
Net revenue	407	439	789	1,033
Other | Personal Systems | Operating segments
Segment Information
Net revenue	434	382	889	783
Supplies | Printing | Operating segments
Segment Information
Net revenue	3,337	2,841	6,483	5,882
Commercial | Printing | Operating segments
Segment Information
Net revenue	1,085	808	2,042	1,884
Consumer | Printing | Operating segments
Segment Information
Net revenue	$ 901	$ 509	$ 1,842	$ 1,116