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Balance Sheet Details - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Jan. 31, 2019
Oct. 31, 2018
Jan. 31, 2018
Oct. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 3,781 $ 4,880    
Restricted cash 124 204    
Cash, cash equivalents and restricted cash $ 3,905 $ 5,084 $ 7,674 $ 9,592