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Severance and Related Charges - Schedule of changes in severance and related charges reserves (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2021
Jan. 26, 2020
Restructuring Reserve [Roll Forward]    
Provision for severance $ 152 $ 0
Employee Severance    
Restructuring Reserve [Roll Forward]    
Balance as of October 25, 2020 0  
Provision for severance 152  
Consumption of reserves (5)  
Balance as of January 31, 2021 $ 147