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Segment Information - Reconciliation of Segment Assets (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Segment Reporting Information [Line Items]    
Assets $ 52,244 $ 51,803
Operating Segment | Compute    
Segment Reporting Information [Line Items]    
Assets 14,159 14,066
Operating Segment | HPC & MCS    
Segment Reporting Information [Line Items]    
Assets 6,568 6,819
Operating Segment | Storage    
Segment Reporting Information [Line Items]    
Assets 6,848 7,214
Operating Segment | A & PS    
Segment Reporting Information [Line Items]    
Assets 455 440
Operating Segment | Intelligent Edge    
Segment Reporting Information [Line Items]    
Assets 3,338 3,318
Operating Segment | Financial Services    
Segment Reporting Information [Line Items]    
Assets 14,610 14,700
Operating Segment | Corporate Investments    
Segment Reporting Information [Line Items]    
Assets 438 461
Corporate and unallocated assets    
Segment Reporting Information [Line Items]    
Assets $ 5,828 $ 4,785