Transformation Programs - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Restructuring Cost and Reserve [Line Items]
Transformation costs	$ 930	$ 950	$ 453
Short-term portion of restructuring reserve, recorded in accrued restructuring	290	366
Cost Optimization and Prioritization Plan
Restructuring Cost and Reserve [Line Items]
Transformation costs	695	384
Cost Optimization and Prioritization Plan \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Total expected costs to be incurred as of October 31, 2021	700
Cost Optimization and Prioritization Plan \| Infrastructure and other
Restructuring Cost and Reserve [Line Items]
Total expected costs to be incurred as of October 31, 2021	600
HPE Next Plan
Restructuring Cost and Reserve [Line Items]
Transformation costs	240	569	462
Long-term portion of restructuring reserve, recorded in Other liabilities	180	91
HPE Next Plan \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Total expected costs to be incurred as of October 31, 2021	1,261
HPE Next Plan \| Infrastructure and other
Restructuring Cost and Reserve [Line Items]
Total expected costs to be incurred as of October 31, 2021	255
HPE Next and Cost Optimization and Prioritization Plan
Restructuring Cost and Reserve [Line Items]
Total expected costs to be incurred as of October 31, 2021	1,300
Short-term portion of restructuring reserve, recorded in accrued restructuring	287	359
HPE Next and Cost Optimization and Prioritization Plan \| Other accrued liabilities
Restructuring Cost and Reserve [Line Items]
Short-term portion of restructuring reserve, recorded in accrued restructuring	27	24
Transformation costs \| Cost Optimization and Prioritization Plan
Restructuring Cost and Reserve [Line Items]
Transformation costs	690	384
Transformation costs \| HPE Next Plan
Restructuring Cost and Reserve [Line Items]
Transformation costs	240	566	453
Non-service net periodic benefit credit \| Cost Optimization and Prioritization Plan
Restructuring Cost and Reserve [Line Items]
Transformation costs	$ 5
Non-service net periodic benefit credit \| HPE Next Plan
Restructuring Cost and Reserve [Line Items]
Transformation costs		$ 3	$ 9