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Balance Sheet Details - Summary of Accounts Receivable, Net (Details) - USD ($)
$ in Millions
Jan. 31, 2019
Nov. 01, 2018
Oct. 31, 2018
Jan. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Accounts receivable $ 3,023     $ 3,117
Unbilled receivables 197     185
Allowance for doubtful accounts (37)   $ (39) (39)
Accounts Receivable, Net, Current $ 3,183 [1] $ 3,301 $ 3,263 [1] $ 3,263
[1] The allowance for doubtful accounts related to accounts receivable was $37 million and $39 million at January 31, 2019 and October 31, 2018, respectively.