Income Taxes (Valuation Allowance) (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 25, 2020	Oct. 27, 2019	Oct. 28, 2018
Changes in allowance for doubtful accounts
Increases	$ 0	$ 0	$ 0
Decreases	0	(3)	(1)
Valuation Allowance of Deferred Tax Assets
Changes in allowance for doubtful accounts
Beginning balance	257	230	227
Increases	57	27	8
Decreases	0	0	(5)
Ending balance	$ 314	$ 257	$ 230

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column B))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column E))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690

+ Details

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- Definition

Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

+ References

+ Details

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- Definition

Amount of decrease in valuation and qualifying accounts and reserves.

+ References

+ Details

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Balance Type:	debit
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- Details

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