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Balance Sheet Details - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Jan. 31, 2019
Oct. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 3,171 $ 3,753    
Restricted cash(1) 377 323    
Cash, cash equivalents and restricted cash $ 3,548 $ 4,076 $ 3,905 $ 5,084