Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jan. 31, 2013 segment	Oct. 31, 2013 segment	Oct. 31, 2012	Oct. 31, 2011
Segment Information
Number of business segments		7
Number of new reporting segments	2	2
Number of reporting segments eliminated	2	2
Segment Reporting Information
Net revenue		$ 112,298	$ 120,357	$ 127,245
Earnings (loss) from operations		7,131	(11,057)	9,677
Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue		(2,896)	(3,180)	(3,442)
Operating segments
Segment Reporting Information
Net revenue		115,194	123,537	130,687
Earnings (loss) from operations		10,848	12,495	13,928
Enterprise Group
Segment Reporting Information
Net revenue		27,303	28,628	30,135
Enterprise Group | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue		(880)	(1,151)	(1,325)
Enterprise Group | Operating segments
Segment Reporting Information
Net revenue		28,183	29,779	31,460
Earnings (loss) from operations		4,301	5,194	6,265
Enterprise Services
Segment Reporting Information
Net revenue		23,041	25,091	25,938
Enterprise Services | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue		(479)	(518)	(330)
Enterprise Services | Operating segments
Segment Reporting Information
Net revenue		23,520	25,609	26,268
Earnings (loss) from operations		679	1,045	1,972
Software
Segment Reporting Information
Net revenue		3,593	3,757	3,128
Software | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue		(320)	(303)	(239)
Software | Operating segments
Segment Reporting Information
Net revenue		3,913	4,060	3,367
Earnings (loss) from operations		866	827	722
HP Financial Services
Segment Reporting Information
Net revenue		3,570	3,784	3,568
HP Financial Services | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue		(59)	(35)	(28)
HP Financial Services | Operating segments
Segment Reporting Information
Net revenue		3,629	3,819	3,596
Earnings (loss) from operations		399	388	348
Corporate Investments
Segment Reporting Information
Net revenue		24	57	154
Corporate Investments | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue			(1)	(12)
Corporate Investments | Operating segments
Segment Reporting Information
Net revenue		24	58	166
Earnings (loss) from operations		(236)	(233)	(1,633)
Printing and Personal Systems Group | Operating segments
Segment Reporting Information
Net revenue		55,925	60,212	65,830
Printing and Personal Systems Group | Personal Systems
Segment Reporting Information
Net revenue		31,124	34,774	38,448
Printing and Personal Systems Group | Personal Systems | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue		(947)	(951)	(1,206)
Printing and Personal Systems Group | Personal Systems | Operating segments
Segment Reporting Information
Net revenue		32,071	35,725	39,654
Earnings (loss) from operations		949	1,689	2,327
Printing and Personal Systems Group | Printing
Segment Reporting Information
Net revenue		23,643	24,266	25,874
Printing and Personal Systems Group | Printing | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue		(211)	(221)	(302)
Printing and Personal Systems Group | Printing | Operating segments
Segment Reporting Information
Net revenue		23,854	24,487	26,176
Earnings (loss) from operations		$ 3,890	$ 3,585	$ 3,927