Segment Information (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Segment Reporting Information
Net revenue	$ 27,309	$ 27,582	$ 55,463	$ 55,941
Operating segments
Segment Reporting Information
Net revenue	28,213	28,489	57,220	57,565
Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(904)	(907)	(1,757)	(1,624)
Enterprise Group
Segment Reporting Information
Net revenue	6,395	6,526	13,186	13,274
Enterprise Group | Operating segments
Segment Reporting Information
Net revenue	6,657	6,794	13,650	13,742
Enterprise Group | Operating segments | Industry Standard Servers
Segment Reporting Information
Net revenue	2,829	2,806	6,007	5,800
Enterprise Group | Operating segments | Technology Services
Segment Reporting Information
Net revenue	2,132	2,247	4,255	4,454
Enterprise Group | Operating segments | Storage
Segment Reporting Information
Net revenue	808	857	1,642	1,690
Enterprise Group | Operating segments | Networking
Segment Reporting Information
Net revenue	658	618	1,288	1,226
Enterprise Group | Operating segments | Business Critical Systems
Segment Reporting Information
Net revenue	230	266	458	572
Enterprise Group | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(262)	(268)	(464)	(468)
Enterprise Services
Segment Reporting Information
Net revenue	5,443	5,889	10,726	11,681
Enterprise Services | Operating segments
Segment Reporting Information
Net revenue	5,702	6,133	11,297	12,171
Enterprise Services | Operating segments | Infrastructure Technology Outsourcing
Segment Reporting Information
Net revenue	3,597	3,855	7,098	7,710
Enterprise Services | Operating segments | Application and Business Services
Segment Reporting Information
Net revenue	2,105	2,278	4,199	4,461
Enterprise Services | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(259)	(244)	(571)	(490)
Software
Segment Reporting Information
Net revenue	891	894	1,737	1,791
Software | Operating segments
Segment Reporting Information
Net revenue	971	967	1,887	1,918
Software | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(80)	(73)	(150)	(127)
HP Financial Services
Segment Reporting Information
Net revenue	847	866	1,701	1,812
HP Financial Services | Operating segments
Segment Reporting Information
Net revenue	867	881	1,737	1,838
HP Financial Services | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(20)	(15)	(36)	(26)
Corporate Investments
Segment Reporting Information
Net revenue	6	10	294	14
Corporate Investments | Operating segments
Segment Reporting Information
Net revenue	6	10	294	14
Printing and Personal Systems Group | Operating segments
Segment Reporting Information
Net revenue	14,010	13,704	28,355	27,882
Printing and Personal Systems Group | Personal Systems
Segment Reporting Information
Net revenue	7,960	7,351	16,270	15,419
Printing and Personal Systems Group | Personal Systems | Operating segments
Segment Reporting Information
Net revenue	8,176	7,610	16,706	15,842
Printing and Personal Systems Group | Personal Systems | Operating segments | Notebooks
Segment Reporting Information
Net revenue	3,977	3,718	8,312	7,846
Printing and Personal Systems Group | Personal Systems | Operating segments | Desktops
Segment Reporting Information
Net revenue	3,343	3,103	6,617	6,424
Printing and Personal Systems Group | Personal Systems | Operating segments | Workstations
Segment Reporting Information
Net revenue	548	521	1,081	1,056
Printing and Personal Systems Group | Personal Systems | Operating segments | Other
Segment Reporting Information
Net revenue	308	268	696	516
Printing and Personal Systems Group | Personal Systems | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	(216)	(259)	(436)	(423)
Printing and Personal Systems Group | Printing
Segment Reporting Information
Net revenue	5,767	6,046	11,549	11,950
Printing and Personal Systems Group | Printing | Operating segments
Segment Reporting Information
Net revenue	5,834	6,094	11,649	12,040
Printing and Personal Systems Group | Printing | Operating segments | Supplies
Segment Reporting Information
Net revenue	3,866	4,122	7,661	8,015
Printing and Personal Systems Group | Printing | Operating segments | Commercial Hardware
Segment Reporting Information
Net revenue	1,402	1,411	2,749	2,785
Printing and Personal Systems Group | Printing | Operating segments | Consumer Hardware
Segment Reporting Information
Net revenue	566	561	1,239	1,240
Printing and Personal Systems Group | Printing | Eliminations of inter-segment net revenue and other
Segment Reporting Information
Net revenue	$ (67)	$ (48)	$ (100)	$ (90)