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, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Segment Information
Net revenue	$ 12,385	$ 11,588	$ 25,069	$ 23,834
Total segment earnings from operations	818	841	1,674	1,769
Stock-based compensation expense	(48)	(40)	(123)	(101)
Restructuring and other charges	(140)	(100)	(203)	(120)
Acquisition-related charges	(20)	0	(36)	0
Amortization of intangible assets	(1)	(6)	(1)	(14)
Defined benefit plan settlement charges	(3)	0	(3)	0
Interest and other, net	(64)	(5)	(145)	(99)
Earnings from continuing operations before taxes	754	836	1,529	1,670
Operating segments
Segment Information
Net revenue	12,408	11,630	25,117	23,742
Total segment earnings from operations	1,043	1,035	2,049	2,028
Net revenue eliminations and other
Segment Information
Net revenue	(23)	(42)	(48)	92
Corporate and unallocated costs and eliminations
Segment Information
Corporate and unallocated costs and eliminations	(13)	(48)	(9)	(24)
Segment reconciling items
Segment Information
Stock-based compensation expense	(48)	(40)	(123)	(101)
Restructuring and other charges	(140)	(100)	(203)	(120)
Acquisition-related charges	(20)	0	(36)	0
Amortization of intangible assets	(1)	(6)	(1)	(14)
Defined benefit plan settlement charges	(3)	0	(3)	0
Interest and other, net	$ (64)	$ (5)	$ (145)	$ (99)