HPE Next - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Oct. 31, 2019
Restructuring Cost and Reserve [Line Items]
Transformation costs	$ 200	$ 54	$ 289	$ 132
Current restructuring liability reported in Accrued restructuring	198		198		$ 195
HPE Next
Restructuring Cost and Reserve [Line Items]
Transformation costs	200	55	289	138
Current restructuring liability reported in Accrued restructuring	177		177		164
Long-term portion of restructuring reserve, recorded in Other liabilities	$ 51		$ 51		$ 56
Transformation Costs | HPE Next
Restructuring Cost and Reserve [Line Items]
Transformation costs		54		132
Non-Service Net Periodic Benefit Credit | HPE Next
Restructuring Cost and Reserve [Line Items]
Transformation costs		$ 1		$ 6