Divestitures (Details) - Divestiture - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jul. 31, 2016	Jul. 31, 2016
Divestiture of Software Assets During Q2
Major components of assets and liabilities included in distribution
Proceeds from divestiture of certain software assets		$ 475
Gain from divestiture of certain software assets	$ 56	103
Divestiture of Software Asset During Q3
Major components of assets and liabilities included in distribution
Gain from divestiture of certain software assets	$ 280	$ 280

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Name:	us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration