Goodwill and Intangible Assets (Details) $ in Millions	9 Months Ended
	Jul. 31, 2015 USD ($) item	Oct. 31, 2014 USD ($)
Goodwill
Balance at beginning of period	$ 31,139
Goodwill acquired during period	1,959
Goodwill divestiture and foreign currency adjustments	(73)
Balance at end of period	33,025
Accumulated impairment losses	14,500	$ 14,500
Personal Systems
Goodwill
Balance at beginning of period	2,588
Balance at end of period	2,588
Printing
Goodwill
Balance at beginning of period	2,591
Goodwill divestiture and foreign currency adjustments	(11)
Balance at end of period	2,580
Enterprise Group
Goodwill
Balance at beginning of period	16,867
Goodwill acquired during period	1,863
Goodwill divestiture and foreign currency adjustments	(20)
Balance at end of period	18,710
Enterprise Services segment
Goodwill
Balance at beginning of period	97
Goodwill divestiture and foreign currency adjustments	(3)
Balance at end of period	94
Accumulated impairment losses	$ 8,000	8,000
Number of reporting units within ES segment | item	2
Software
Goodwill
Balance at beginning of period	$ 8,852
Goodwill acquired during period	96
Goodwill divestiture and foreign currency adjustments	(39)
Balance at end of period	8,909
Accumulated impairment losses	5,700	5,700
HP Financial Services
Goodwill
Balance at beginning of period	144
Balance at end of period	144
Corporate Investments
Goodwill
Accumulated impairment losses	$ 800	$ 800