HPE Next (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Oct. 31, 2017
Restructuring Cost and Reserve [Line Items]
Transformation costs	$ 123	$ 0	$ 368	$ 0
Current restructuring liability reported in Accrued restructuring	286		286		$ 445
Long-term portion of restructuring reserve, recorded in Other liabilities	55		55		96
HPE Next
Restructuring Cost and Reserve [Line Items]
Transformation costs	123		368
Total costs expected to be incurred, as of April 30, 2018	900		900
Current restructuring liability reported in Accrued restructuring	222		222		287
Long-term portion of restructuring reserve, recorded in Other liabilities	59		59		$ 9
HPE Next | Employee Severance
Restructuring Cost and Reserve [Line Items]
Total costs expected to be incurred, as of April 30, 2018	700		700
HPE Next | Infrastructure and other
Restructuring Cost and Reserve [Line Items]
Total costs expected to be incurred, as of April 30, 2018	$ 200		$ 200