Segment Information - Schedule of Reconciliation of Segment Operating Results to HP Consolidated Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Segment Information
Net revenue	$ 11,892	$ 12,362	$ 35,726	$ 39,197
Total segment earnings from operations	1,117	1,007	2,886	3,122
Stock-based compensation expense	(39)	(58)	(140)	(168)
Restructuring and other charges	(36)	(1)	(156)	(22)
Amortization of intangible assets	(2)	(24)	(16)	(76)
Acquisition-related charges	0	(1)	0	(1)
Defined benefit plan settlement credits	0	64	0	64
Non-operating retirement-related credits	38	58	118	174
Interest and other, net	(36)	(90)	(135)	(289)
Total earnings from continuing operations before taxes	1,081	917	2,751	2,833
Operating Segments
Segment Information
Net revenue	11,935	12,670	35,677	40,109
Total segment earnings from operations	1,201	1,095	3,229	3,637
Intersegment Net Revenue Eliminations and Other
Segment Information
Net revenue	(43)	(308)	49	(912)
Corporate Costs and Eliminations
Segment Information
Corporate costs and eliminations	$ (45)	$ (126)	$ (149)	$ (486)