Segment Information - Schedule of Reconciliation of Segment Operating Results to HP Consolidated Results (Details) - USD ($) $ in Millions	3 Months Ended
Jan. 31, 2020	Jan. 31, 2019
Segment Information
Net revenue	$ 14,618	$ 14,710
Total segment earnings from operations	865	926
Restructuring and other charges	(291)	(55)
Acquisition-related charges	0	(10)
Amortization of intangible assets	(26)	(29)
Interest and other, net	13	(26)
Earnings before taxes	878	900
Operating segments
Segment Information
Net revenue	14,617	14,714
Total segment earnings from operations	1,403	1,207
Other
Segment Information
Net revenue	1	(4)
Corporate and unallocated costs and other	(112)	(80)
Stock-based compensation expense	(109)	(107)
Restructuring and other charges	(291)	(55)
Acquisition-related charges	0	(10)
Amortization of intangible assets	(26)	(29)
Interest and other, net	13	(26)
Personal Systems \| Operating segments
Segment Information
Net revenue	9,892	9,657
Total segment earnings from operations	662	410
Printing \| Operating segments
Segment Information
Net revenue	4,724	5,056
Total segment earnings from operations	754	821
Corporate Investments \| Operating segments
Segment Information
Net revenue	1	1
Total segment earnings from operations	(13)	(24)
Notebooks \| Personal Systems \| Operating segments
Segment Information
Net revenue	5,974	5,919
Desktops \| Personal Systems \| Operating segments
Segment Information
Net revenue	2,923	2,857
Workstations \| Personal Systems \| Operating segments
Segment Information
Net revenue	594	562
Other \| Personal Systems \| Operating segments
Segment Information
Net revenue	401	319
Supplies \| Printing \| Operating segments
Segment Information
Net revenue	3,041	3,267
Commercial Hardware \| Printing \| Operating segments
Segment Information
Net revenue	1,076	1,090
Consumer Hardware \| Printing \| Operating segments
Segment Information
Net revenue	$ 607	$ 699

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