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Transformation Programs - Transformation Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Total $ 930 $ 950 $ 453
Cost Optimization and Prioritization Plan      
Restructuring Cost and Reserve [Line Items]      
Program management 83 55  
IT costs 14 0  
Restructuring charges 598 329  
Total 695 384  
HPE Next Plan      
Restructuring Cost and Reserve [Line Items]      
Program management 14 35 29
IT costs 174 100 134
Restructuring charges 22 440 219
Gains on real estate sales (3) (45) (7)
Impairment on real estate assets 4 10 47
Other 29 29 40
Total $ 240 $ 569 $ 462