Segment Information (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Segment Reporting Information
Net revenue	$ 25,453	$ 27,309	$ 52,292	$ 55,463
Operating segments
Segment Reporting Information
Net revenue	26,270	28,189	54,021	57,173
Elimination of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(817)	(880)	(1,729)	(1,710)
Personal Systems | Operating segments
Segment Reporting Information
Net revenue		8,176	16,284	16,706
Personal Systems | Operating segments | Notebooks
Segment Reporting Information
Net revenue	4,170	3,977	8,894	8,312
Personal Systems | Operating segments | Desktops
Segment Reporting Information
Net revenue	2,762	3,343	5,711	6,617
Personal Systems | Operating segments | Workstations
Segment Reporting Information
Net revenue	513	548	1,039	1,081
Personal Systems | Operating segments | Other
Segment Reporting Information
Net revenue	295	308	640	696
Printing | Operating segments
Segment Reporting Information
Net revenue	5,453	5,834	10,996	11,649
Printing | Operating segments | Supplies
Segment Reporting Information
Net revenue	3,684	3,866	7,285	7,661
Printing | Operating segments | Commercial Hardware
Segment Reporting Information
Net revenue	1,304	1,402	2,620	2,749
Printing | Operating segments | Consumer Hardware
Segment Reporting Information
Net revenue	465	566	1,091	1,239
Enterprise Group
Segment Reporting Information
Net revenue	6,323	6,395	13,003	13,186
Enterprise Group | Operating segments
Segment Reporting Information
Net revenue	6,561	6,633	13,542	13,603
Enterprise Group | Operating segments | Industry Standard Servers
Segment Reporting Information
Net revenue	3,138	2,829	6,525	6,007
Enterprise Group | Operating segments | Technology Services
Segment Reporting Information
Net revenue	1,932	2,108	3,919	4,208
Enterprise Group | Operating segments | Storage
Segment Reporting Information
Net revenue	740	808	1,577	1,642
Enterprise Group | Operating segments | Networking
Segment Reporting Information
Net revenue	556	658	1,118	1,288
Enterprise Group | Operating segments | Business Critical Systems
Segment Reporting Information
Net revenue	195	230	403	458
Enterprise Group | Elimination of inter-segment net revenue and other
Segment Reporting Information
Net revenue	238	238	539	417
Enterprise Services
Segment Reporting Information
Net revenue	4,626	5,443	9,406	10,726
Enterprise Services | Operating segments
Segment Reporting Information
Net revenue	4,817	5,702	9,810	11,297
Enterprise Services | Operating segments | Infrastructure Technology Outsourcing
Segment Reporting Information
Net revenue	2,871	3,597	6,003	7,098
Enterprise Services | Operating segments | Application and Business Services
Segment Reporting Information
Net revenue	1,946	2,105	3,807	4,199
Enterprise Services | Elimination of inter-segment net revenue and other
Segment Reporting Information
Net revenue	191	259	404	571
Software
Segment Reporting Information
Net revenue	820	891	1,631	1,737
Software | Operating segments
Segment Reporting Information
Net revenue	892	971	1,763	1,887
Software | Elimination of inter-segment net revenue and other
Segment Reporting Information
Net revenue	72	80	132	150
HP Financial Services
Segment Reporting Information
Net revenue	784	847	1,565	1,701
HP Financial Services | Operating segments
Segment Reporting Information
Net revenue	805	867	1,608	1,737
HP Financial Services | Elimination of inter-segment net revenue and other
Segment Reporting Information
Net revenue	21	20	43	36
Corporate Investments
Segment Reporting Information
Net revenue	2	6	18	294
Corporate Investments | Operating segments
Segment Reporting Information
Net revenue	2	6	18	294
Printing and Personal Systems Group | Operating segments
Segment Reporting Information
Net revenue	13,193	14,010	27,280	28,355
Printing and Personal Systems Group | Personal Systems
Segment Reporting Information
Net revenue	7,514	7,960	15,800	16,270
Printing and Personal Systems Group | Personal Systems | Operating segments
Segment Reporting Information
Net revenue	7,740	8,176	16,284	16,706
Printing and Personal Systems Group | Personal Systems | Elimination of inter-segment net revenue and other
Segment Reporting Information
Net revenue	226	216	484	436
Printing and Personal Systems Group | Printing
Segment Reporting Information
Net revenue	5,384	5,767	10,869	11,549
Printing and Personal Systems Group | Printing | Operating segments
Segment Reporting Information
Net revenue	5,453	5,834	10,996	11,649
Printing and Personal Systems Group | Printing | Elimination of inter-segment net revenue and other
Segment Reporting Information
Net revenue	$ 69	$ 67	$ 127	$ 100