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Balance Sheet Details - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Apr. 30, 2020
Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 4,625 $ 4,233    
Restricted cash 131 388    
Total $ 4,756 $ 4,621 $ 5,990 $ 4,076