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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