Acquisitions and Divestitures - Table (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 27,261	$ 25,960	$ 24,178
Intangible assets		25
Total fair value of consideration		$ 55
Undefined
Business Acquisition [Line Items]
Goodwill	1,987
Intangible assets	704
Net assets assumed	221
Total fair value of consideration	3,071
In-process research and development | Undefined
Business Acquisition [Line Items]
Intangible assets	$ 159