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HPE Next (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Restructuring Cost and Reserve [Line Items]                      
Transformation costs $ (74) $ 131 $ 123 $ 245 $ 328 $ 31 $ 0 $ 0 $ 425 $ 359 $ 0
Short-term portion of restructuring reserve, recorded in Accrued restructuring 294       445       294 445  
Long-term portion of restructuring reserve, recorded in Other liabilities 31       96       31 96  
Assets held for sale 6       14       6 14  
HPE Next                      
Restructuring Cost and Reserve [Line Items]                      
Transformation costs                 425 359  
Expected costs 1,400               1,400    
Short-term portion of restructuring reserve, recorded in Accrued restructuring 241       287       241 287  
Long-term portion of restructuring reserve, recorded in Other liabilities 83       $ 9       83 $ 9  
HPE Next | Employee Severance                      
Restructuring Cost and Reserve [Line Items]                      
Expected costs 1,200               1,200    
HPE Next | Infrastructure and other                      
Restructuring Cost and Reserve [Line Items]                      
Expected costs $ 200               200    
Interest and other, net | HPE Next                      
Restructuring Cost and Reserve [Line Items]                      
Transformation costs                 $ 20