Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Jul. 31, 2013	Jan. 31, 2013 segment	Jul. 31, 2012	Jul. 31, 2013 segment	Jul. 31, 2012	Oct. 31, 2012
Segment Reporting Information
Number of business segments				7
Number of new financial reporting segments		2		2
Number of financial reporting segments eliminated		2		2
Net revenue:
Net revenue	$ 27,226		$ 29,669	$ 83,167	$ 90,398
Elimination of intersegment net revenue and other	(776)		(792)	(2,070)	(2,374)
Earnings (loss) from operations	1,855		(8,833)	5,208	(4,569)
Earnings before taxes:
Amortization of purchased intangible assets	(356)		(476)	(1,056)	(1,412)
Impairment of goodwill and purchased intangible assets			(9,188)		(9,188)
Restructuring charges	(81)		(1,795)	(619)	(1,888)
Acquisition-related charges	(4)		(3)	(19)	(42)
Interest and other, net	(146)		(224)	(518)	(688)
Earnings (loss) before taxes	1,709		(9,057)	4,690	(5,257)
Total assets	105,800			105,800		108,768
Notebooks
Net revenue:
Net revenue - segment information	3,722		4,416	11,568	14,258
Desktops
Net revenue:
Net revenue - segment information	3,147		3,486	9,571	10,519
Workstations
Net revenue:
Net revenue - segment information	537		526	1,593	1,598
Other
Net revenue:
Net revenue - segment information	298		208	760	623
Supplies
Net revenue:
Net revenue - segment information	3,839		4,005	11,854	12,144
Commercial Hardware
Net revenue:
Net revenue - segment information	1,399		1,445	4,151	4,413
Consumer Hardware
Net revenue:
Net revenue - segment information	565		567	1,805	1,850
Industry Standard Servers
Net revenue:
Net revenue - segment information	2,851		3,187	8,651	9,445
Technology Services
Net revenue:
Net revenue - segment information	2,174		2,349	6,689	6,948
Storage
Net revenue:
Net revenue - segment information	833		924	2,523	2,869
Networking
Net revenue:
Net revenue - segment information	644		647	1,870	1,847
Business Critical Systems
Net revenue:
Net revenue - segment information	284		385	856	1,211
Infrastructure Technology Outsourcing
Net revenue:
Net revenue - segment information	3,662		3,934	11,119	11,868
Application and Business Services
Net revenue:
Net revenue - segment information	2,181		2,463	6,642	7,389
Total
Net revenue:
Net revenue	27,226		29,669	83,167	90,398
Elimination of intersegment net revenue and other	776		792	2,070	2,374
Net revenue - segment information	28,002		30,461	85,237	92,772
Earnings (loss) from operations	2,603		3,093	7,788	9,123
Personal Systems
Net revenue:
Net revenue	7,441		8,388	22,806	26,271
Elimination of intersegment net revenue and other	263		248	686	727
Net revenue - segment information	7,704		8,636	23,492	26,998
Earnings (loss) from operations	228		405	690	1,380
Printing
Net revenue:
Net revenue	5,752		5,956	17,669	18,250
Elimination of intersegment net revenue and other	51		61	141	157
Net revenue - segment information	5,803		6,017	17,810	18,407
Earnings (loss) from operations	908		949	2,819	2,518
Printing and Personal Systems Group
Net revenue:
Net revenue - segment information	13,507		14,653	41,302	45,405
Enterprise Group
Net revenue:
Net revenue	6,567		7,222	19,979	21,423
Elimination of intersegment net revenue and other	219		270	610	897
Net revenue - segment information	6,786		7,492	20,589	22,320
Earnings (loss) from operations	1,033		1,284	3,199	3,965
Earnings before taxes:
Total assets						30,900
Enterprise Services
Net revenue:
Net revenue	5,714		6,271	17,395	18,905
Elimination of intersegment net revenue and other	129		126	366	352
Net revenue - segment information	5,843		6,397	17,761	19,257
Earnings (loss) from operations	192		240	424	622
Earnings before taxes:
Total assets						16,400
Software
Net revenue:
Net revenue	884		893	2,624	2,672
Elimination of intersegment net revenue and other	98		80	225	217
Net revenue - segment information	982		973	2,849	2,889
Earnings (loss) from operations	201		175	538	509
HP Financial Services
Net revenue:
Net revenue	863		928	2,675	2,830
Elimination of intersegment net revenue and other	16		7	42	23
Net revenue - segment information	879		935	2,717	2,853
Earnings (loss) from operations	99		97	297	284
Corporate Investments
Net revenue:
Net revenue	5		11	19	47
Elimination of intersegment net revenue and other					1
Net revenue - segment information	5		11	19	48
Earnings (loss) from operations	(58)		(57)	(179)	(155)
Significant Reconciling Items
Net revenue:
Net revenue	27,226		29,669	83,167	90,398
Elimination of intersegment net revenue and other	(776)		(792)	(2,070)	(2,374)
Net revenue - segment information	28,002		30,461	85,237	92,772
Earnings (loss) from operations	2,603		3,093	7,788	9,123
Earnings before taxes:
Corporate and unallocated costs and eliminations	(200)		(314)	(488)	(668)
Unallocated costs related to stock-based compensation expense	(107)		(150)	(398)	(494)
Amortization of purchased intangible assets	(356)		(476)	(1,056)	(1,412)
Impairment of goodwill and purchased intangible assets			(9,188)		(9,188)
Restructuring charges	(81)		(1,795)	(619)	(1,888)
Acquisition-related charges	(4)		(3)	(19)	(42)
Interest and other, net	(146)		(224)	(518)	(688)
Earnings (loss) before taxes	$ 1,709		$ (9,057)	$ 4,690	$ (5,257)