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Segment Information - Reconciliation of Segment Assets (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Segment Reporting Information [Line Items]    
Assets $ 54,132 $ 54,015
Operating Segment | Compute    
Segment Reporting Information [Line Items]    
Assets 15,458 14,962
Operating Segment | HPC & MCS    
Segment Reporting Information [Line Items]    
Assets 5,957 6,245
Operating Segment | Storage    
Segment Reporting Information [Line Items]    
Assets 6,569 6,438
Operating Segment | Intelligent Edge    
Segment Reporting Information [Line Items]    
Assets 4,421 4,352
Operating Segment | Financial Services    
Segment Reporting Information [Line Items]    
Assets 14,433 14,765
Operating Segment | Corporate Investments and Other    
Segment Reporting Information [Line Items]    
Assets 1,163 1,124
Corporate and unallocated assets    
Segment Reporting Information [Line Items]    
Assets $ 6,131 $ 6,129