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Transformation Programs - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Oct. 31, 2020
Restructuring Cost and Reserve [Line Items]          
Transformation costs $ 209 $ 200 $ 520 $ 289  
Current restructuring liability reported in Accrued restructuring 233   233   $ 366
Transformation Program          
Restructuring Cost and Reserve [Line Items]          
Current restructuring liability reported in Accrued restructuring 227   227   359
Transformation Program | Other Accrued Liabilities          
Restructuring Cost and Reserve [Line Items]          
Current restructuring liability reported in Accrued restructuring 32   32   24
Transformation Program | Long-Term Other Liabilities          
Restructuring Cost and Reserve [Line Items]          
Long-term portion of restructuring reserve, recorded in Other liabilities 200   200   $ 91
HPE Next          
Restructuring Cost and Reserve [Line Items]          
Transformation costs 58 $ 200 117 $ 289  
HPE Next | Transformation Costs          
Restructuring Cost and Reserve [Line Items]          
Transformation costs 151   403    
HPE Next | Non-Service Net Periodic Benefit Credit          
Restructuring Cost and Reserve [Line Items]          
Transformation costs 2   2    
Cost optimization and prioritization plan          
Restructuring Cost and Reserve [Line Items]          
Transformation costs $ 153   $ 405