Taxes on Earnings (Detail 7) - USD ($) $ in Millions	Oct. 31, 2017	Oct. 31, 2016
Valuation allowance
Valuation allowance for deferred tax assets	$ 2,789	$ 2,095
Operating loss carryforwards \| State
Valuation allowance
Valuation allowance for deferred tax assets	108
Operating loss carryforwards \| Foreign
Valuation allowance
Valuation allowance for deferred tax assets	$ 1,400

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant