Cash, Cash Equivalents and Investments (Gains and Losses on Investments) (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 29, 2017	Oct. 30, 2016	Oct. 25, 2015
Gains and Losses on Investments
Gross realized gains	$ 14	$ 10	$ 9
Gross realized losses	$ 1	$ 2	$ 3

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

Name:	us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration