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Balance Sheet Details - Summary of Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts receivable $ 2,684 $ 2,782
Unbilled receivables 218 206
Allowance for doubtful accounts (38) (31)
Total $ 2,864 $ 2,957