Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended	12 Months Ended									12 Months Ended		12 Months Ended										12 Months Ended
	Jan. 31, 2013 segment	Oct. 31, 2013 segment	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012 Autonomy	Oct. 31, 2012 Autonomy Goodwill and Intangibles	Oct. 31, 2013 TS reporting unit	Oct. 31, 2013 Personal Systems	Oct. 31, 2012 Personal Systems	Oct. 31, 2011 Personal Systems	Oct. 31, 2012 Printing	Oct. 31, 2013 Printing	Oct. 31, 2013 Enterprise Group	Oct. 31, 2012 Enterprise Group	Oct. 31, 2013 Enterprise Services	Oct. 31, 2012 Enterprise Services	Oct. 31, 2013 Software	Oct. 31, 2012 Software Item	Oct. 31, 2012 Software Autonomy	Oct. 31, 2013 HP Financial Services	Oct. 31, 2012 HP Financial Services	Oct. 31, 2011 HP Financial Services	Oct. 31, 2012 Corporate Investments	Oct. 31, 2013 Corporate Investments	Oct. 31, 2011 Corporate Investments	Oct. 31, 2013 ESSN reporting unit	Aug. 01, 2012 Other reporting units
Goodwill
Net balance at the beginning of the period	$ 31,069,000,000	$ 31,069,000,000	$ 44,551,000,000				$ 9,280,000,000	$ 2,498,000,000	$ 2,498,000,000	$ 2,498,000,000	$ 2,471,000,000	$ 2,487,000,000	$ 17,041,000,000	$ 17,349,000,000		$ 8,001,000,000	$ 8,899,000,000	$ 14,063,000,000		$ 144,000,000	$ 144,000,000	$ 144,000,000	$ 25,000,000			$ 7,800,000,000
Goodwill acquired during the period		112,000,000	16,000,000								16,000,000				112,000,000
Goodwill adjustments/reclassifications		(57,000,000)	207,000,000										39,000,000	(308,000,000)	(15,000,000)	(40,000,000)	(81,000,000)	580,000,000					(25,000,000)
Finite-lived Intangible Assets, Accumulated Impairment Losses			(4,300,000,000)		(3,100,000,000)
Impairment loss			(13,705,000,000)													(7,961,000,000)		(5,744,000,000)
Net balance at the end of the period		31,124,000,000	31,069,000,000	44,551,000,000	1,200,000,000		9,280,000,000	2,498,000,000	2,498,000,000	2,498,000,000	2,487,000,000	2,487,000,000	17,080,000,000	17,041,000,000	97,000,000		8,818,000,000	8,899,000,000		144,000,000	144,000,000	144,000,000				7,800,000,000
Accumulated impairment loss		14,518,000,000	14,518,000,000												7,961,000,000	7,961,000,000	5,744,000,000	5,744,000,000					813,000,000	813,000,000	813,000,000		0
Goodwill adjustments/reclassifications			9,300,000,000	9,300,000,000
Impairment of goodwill and intangible assets			$ 18,035,000,000	$ 885,000,000		$ 8,800,000,000													$ 8,800,000,000
Number of reporting units within Software segment																		2
Number of new reporting segments	2	2
Number of reporting segments eliminated	2	2