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, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Segment Information
Net revenue	$ 14,036	$ 14,003	$ 28,746	$ 28,520
Total segment earnings from operations	928	906	1,854	1,819
Restructuring and other charges	(69)	(57)	(124)	(88)
Acquisition-related charges	(11)	(45)	(21)	(87)
Amortization of intangible assets	(29)	(20)	(58)	(40)
Interest and other, net	(45)	(823)	(71)	(831)
Earnings before taxes	883	83	1,783	988
Operating segments
Segment Information
Net revenue	14,037	14,004	28,751	28,521
Total segment earnings from operations	1,200	1,145	2,407	2,260
Other
Segment Information
Net revenue	(1)	(1)	(5)	(1)
Corporate and unallocated costs and other	(97)	(54)	(177)	(78)
Stock-based compensation expense	(66)	(63)	(173)	(148)
Restructuring and other charges	(69)	(57)	(124)	(88)
Acquisition-related charges	(11)	(45)	(21)	(87)
Amortization of intangible assets	(29)	(20)	(58)	(40)
Interest and other, net	(45)	(823)	(71)	(831)
Personal Systems | Operating segments
Segment Information
Net revenue	8,921	8,762	18,578	18,202
Total segment earnings from operations	385	329	795	664
Printing | Operating segments
Segment Information
Net revenue	5,116	5,241	10,172	10,317
Total segment earnings from operations	839	837	1,660	1,636
Corporate Investments | Operating segments
Segment Information
Net revenue	0	1	1	2
Total segment earnings from operations	$ (24)	$ (21)	$ (48)	$ (40)