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Taxes on Earnings - Uncertain Tax Positions (Details)
$ in Millions
 12 Months Ended
Oct. 31, 2021
USD ($)
country
Oct. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
Reconciliation of unrecognized tax benefits      
Balance at beginning of year $ 2,159 $ 2,269 $ 8,826
Increases:      
For current year's tax positions 24 27 43
For prior years' tax positions 64 40 37
Decreases:      
For prior years' tax positions (31) (71) (17)
Statute of limitations expiration (44) (17) (38)
Settlements with taxing authorities (15) (53) (7)
Settlements related to joint and several positions of former Parent (26) (36) (6,575)
Balance at end of year 2,131 2,159 2,269
Unrecognized tax benefits that would affect effective tax rate if realized 688 731 772
Income tax expense (interest) and penalties from uncertain tax positions 17 (10) $ (13)
Accrued income tax for interest and penalties $ 136 $ 119  
Likelihood of no resolution period 12 months    
Likelihood of conclusion period for certain federal, foreign and state tax issues 12 months    
Reasonably possible decrease in existing unrecognized tax benefits within the next 12 months $ 69    
Number of other countries in which HPE is subject to income taxes | country 90    
Undistributed earnings from non-U.S. operations $ 8,900