Goodwill and Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Apr. 30, 2014	Oct. 31, 2013
Intangible assets
Amortizable intangible assets, accumulated amortization	$ (4,388)	$ (4,886)
Finite-lived Intangible Assets, Accumulated Impairment Losses	(4,330)	(4,330)
Amortizable intangible assets, net	2,559
Intangible assets, gross	11,280	12,385
Total Intangible Assets- Net	2,562	3,169
Amount of fully amortized intangible assets	737
In-process research and development
Intangible assets
Amortizable intangible assets, gross	3	3
Amortizable intangible assets, net	3	3
Customer contracts, customer lists and distribution agreements
Intangible assets
Amortizable intangible assets, gross	5,316	5,321
Amortizable intangible assets, accumulated amortization	(2,982)	(2,709)
Finite-lived Intangible Assets, Accumulated Impairment Losses	(856)	(856)
Amortizable intangible assets, net	1,478	1,756
Developed and core technology and patents
Intangible assets
Amortizable intangible assets, gross	4,238	5,331
Amortizable intangible assets, accumulated amortization	(1,159)	(1,966)
Finite-lived Intangible Assets, Accumulated Impairment Losses	(2,138)	(2,138)
Amortizable intangible assets, net	941	1,227
Trade name and trade marks
Intangible assets
Amortizable intangible assets, gross	1,723	1,730
Amortizable intangible assets, accumulated amortization	(247)	(211)
Intangible Assets, Accumulated Impairment Losses	(1,336)	(1,336)
Amortizable intangible assets, net	$ 140	$ 183