Severance and Related Charges - Schedule of changes in severance and related charges reserves (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
May 02, 2021	Jan. 31, 2021	Apr. 26, 2020	May 02, 2021	Apr. 26, 2020
Restructuring Reserve [Roll Forward]
Provision for severance	$ 6		$ 0	$ 158	$ 0
Employee Severance
Restructuring Reserve [Roll Forward]
Balance as of October 25, 2020	147	$ 0		0
Provision for severance	6	152
Consumption of reserves	(117)	(5)
Balance as of January 31, 2021	$ 36	$ 147		$ 36

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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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.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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