Segment Information (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Segment Reporting Information
Net revenue	$ 27,585	$ 27,226	$ 83,048	$ 83,167
Operating segments
Segment Reporting Information
Net revenue	28,540	28,172	85,760	85,737
Intersegment net revenue and other
Segment Reporting Information
Net revenue	(955)	(946)	(2,712)	(2,570)
Enterprise Group
Segment Reporting Information
Net revenue	6,666	6,504	19,852	19,778
Enterprise Group | Operating segments
Segment Reporting Information
Net revenue	6,894	6,764	20,544	20,506
Enterprise Group | Operating segments | Industry Standard Servers
Segment Reporting Information
Net revenue	3,097	2,851	9,104	8,651
Enterprise Group | Operating segments | Technology Services
Segment Reporting Information
Net revenue	2,096	2,152	6,351	6,606
Enterprise Group | Operating segments | Storage
Segment Reporting Information
Net revenue	796	833	2,438	2,523
Enterprise Group | Operating segments | Networking
Segment Reporting Information
Net revenue	672	644	1,960	1,870
Enterprise Group | Operating segments | Business Critical Systems
Segment Reporting Information
Net revenue	233	284	691	856
Enterprise Group | Intersegment net revenue and other
Segment Reporting Information
Net revenue	(228)	(260)	(692)	(728)
Enterprise Services
Segment Reporting Information
Net revenue	5,328	5,714	16,054	17,395
Enterprise Services | Operating segments
Segment Reporting Information
Net revenue	5,590	5,972	16,887	18,143
Enterprise Services | Operating segments | Infrastructure Technology Outsourcing
Segment Reporting Information
Net revenue	3,494	3,791	10,592	11,501
Enterprise Services | Operating segments | Application and Business Services
Segment Reporting Information
Net revenue	2,096	2,181	6,295	6,642
Enterprise Services | Intersegment net revenue and other
Segment Reporting Information
Net revenue	(262)	(258)	(833)	(748)
Software
Segment Reporting Information
Net revenue	873	912	2,610	2,703
Software | Operating segments
Segment Reporting Information
Net revenue	959	1,010	2,846	2,928
Software | Intersegment net revenue and other
Segment Reporting Information
Net revenue	(86)	(98)	(236)	(225)
HP Financial Services
Segment Reporting Information
Net revenue	833	863	2,534	2,675
HP Financial Services | Operating segments
Segment Reporting Information
Net revenue	855	879	2,592	2,717
HP Financial Services | Intersegment net revenue and other
Segment Reporting Information
Net revenue	(22)	(16)	(58)	(42)
Corporate Investments
Segment Reporting Information
Net revenue	3	5	297	19
Corporate Investments | Operating segments
Segment Reporting Information
Net revenue	3	5	297	19
Printing and Personal Systems Group | Operating segments
Segment Reporting Information
Net revenue	14,239	13,542	42,594	41,424
Printing and Personal Systems Group | Personal Systems
Segment Reporting Information
Net revenue	8,368	7,470	24,638	22,889
Printing and Personal Systems Group | Personal Systems | Operating segments
Segment Reporting Information
Net revenue	8,649	7,733	25,355	23,575
Printing and Personal Systems Group | Personal Systems | Operating segments | Notebooks
Segment Reporting Information
Net revenue	4,359	3,722	12,671	11,568
Printing and Personal Systems Group | Personal Systems | Operating segments | Desktops
Segment Reporting Information
Net revenue	3,395	3,147	10,012	9,571
Printing and Personal Systems Group | Personal Systems | Operating segments | Workstations
Segment Reporting Information
Net revenue	579	537	1,660	1,593
Printing and Personal Systems Group | Personal Systems | Operating segments | Other
Segment Reporting Information
Net revenue	316	327	1,012	843
Printing and Personal Systems Group | Personal Systems | Intersegment net revenue and other
Segment Reporting Information
Net revenue	(281)	(263)	(717)	(686)
Printing and Personal Systems Group | Printing
Segment Reporting Information
Net revenue	5,514	5,758	17,063	17,708
Printing and Personal Systems Group | Printing | Operating segments
Segment Reporting Information
Net revenue	5,590	5,809	17,239	17,849
Printing and Personal Systems Group | Printing | Operating segments | Supplies
Segment Reporting Information
Net revenue	3,660	3,839	11,321	11,854
Printing and Personal Systems Group | Printing | Operating segments | Commercial Hardware
Segment Reporting Information
Net revenue	1,401	1,405	4,150	4,190
Printing and Personal Systems Group | Printing | Operating segments | Consumer Hardware
Segment Reporting Information
Net revenue	529	565	1,768	1,805
Printing and Personal Systems Group | Printing | Intersegment net revenue and other
Segment Reporting Information
Net revenue	$ (76)	$ (51)	$ (176)	$ (141)