HPE Next (Details 2) - 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 Reserve
Charges	$ 5	$ 2	$ 9	$ 3	$ 113	$ 152	$ 69	$ 83	$ 19	$ 417	$ 417
HPE Next
Restructuring Reserve
Charges									531	296
HPE Next | Employee Severance
Restructuring Reserve
Balance at the beginning of the period				296				0	296	0
Charges									470	296
Cash payments									(452)
Non-cash items									(23)
Balance at the end of the period	291				296				291	296	0
Total costs incurred to date as of October 31, 2018	766								766
Total expected costs to be incurred as of October 31, 2018	1,200								1,200
HPE Next | Infrastructure and other
Restructuring Reserve
Balance at the beginning of the period				$ 0				$ 0	0	0
Charges									61	0
Cash payments									(14)
Non-cash items									(14)
Balance at the end of the period	33				$ 0				33	$ 0	$ 0
Total costs incurred to date as of October 31, 2018	61								61
Total expected costs to be incurred as of October 31, 2018	$ 180								$ 180