Cash, Cash Equivalents and Investments (Gains and Losses on Investments) (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 27, 2019	Oct. 28, 2018	Oct. 29, 2017
Gains and Losses on Investments
Gross realized gains	$ 10	$ 29	$ 14
Gross realized losses	$ 2	$ 3	$ 1

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

No definition available.

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