Severance and Related Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Jan. 31, 2021	Jan. 26, 2020	Oct. 25, 2020
Restructuring Cost and Reserve [Line Items]
Provision for severance	$ 152	$ 0
Employee Severance
Restructuring Cost and Reserve [Line Items]
Provision for severance	152
Restructuring reserve	$ 147		$ 0

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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