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Balance Sheet Details - Summary of Accounts Receivable, Net (Details) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020	Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ 2,788	$ 3,227
Unbilled receivables	194	205
Allowances	(46)	(46)	$ (31)
Total	$ 2,936	$ 3,386

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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