Goodwill and Intangible Assets (Details) $ in Millions		12 Months Ended
	Aug. 01, 2015 USD ($)	Oct. 31, 2015 USD ($) item	Oct. 31, 2014 USD ($)	Oct. 31, 2013 USD ($)
Goodwill
Balance at beginning of period		$ 31,139	$ 31,124
Goodwill acquired during period		1,987	12
Goodwill divestiture and foreign currency adjustments		(185)	3
Balance at end of period		32,941	31,139	$ 31,124
Impairment loss			0	0
Accumulated impairment losses			14,500
Personal Systems
Goodwill
Balance at beginning of period		2,588	2,588
Balance at end of period		2,588	2,588	2,588
Printing
Goodwill
Balance at beginning of period		3,103	3,103
Goodwill divestiture and foreign currency adjustments		(11)
Balance at end of period		3,092	3,103	3,103
Goodwill transferred		512
Enterprise Group
Goodwill
Balance at beginning of period		16,867	16,864
Goodwill acquired during period		1,891
Goodwill divestiture and foreign currency adjustments		(46)	3
Balance at end of period		18,712	16,867	16,864
Enterprise Services segment
Goodwill
Balance at beginning of period		97	97
Goodwill divestiture and foreign currency adjustments		(5)
Balance at end of period		92	97	97
Accumulated impairment losses		8,000	8,000	8,000
Software
Goodwill
Balance at beginning of period		8,340	8,328
Goodwill acquired during period		96	12
Goodwill divestiture and foreign currency adjustments		(123)
Balance at end of period		8,313	8,340	8,328
Accumulated impairment losses		5,700	5,700	5,700
Goodwill transferred		(512)
HP Financial Services
Goodwill
Balance at beginning of period		144	144
Balance at end of period		144	144	144
Corporate Investments
Goodwill
Accumulated impairment losses		$ 800	$ 800	$ 800
Other reporting units
Goodwill
Impairment loss	$ 0
E S Segment Member
Goodwill
Number of reporting units | item		2