Retirement and Post-Retirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Total net pension benefit cost		$ 18	$ 38	$ 129	$ 108
Pre-tax benefit	[1]	(24)	$ 0	(45)	$ 0
Spin-off
Defined Benefit Plan Disclosure [Line Items]
Contributions by the Company				1,900
Post-retirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Payments to cover benefit claims				2
Expected 2017 contributions to be made by the Company		3		3
Non-U.S. pension plans
Defined Benefit Plan Disclosure [Line Items]
Contributions by the Company				2,100
Expected 2017 contributions to be made by the Company		348		348
Non-U.S. pension plans | Spin-off
Defined Benefit Plan Disclosure [Line Items]
Contributions by the Company				1,900
Expected 2017 contributions to be made by the Company		299		299
Expected contributions to be made by the Company during the remainder of fiscal 2017		47		47
U.S. non-qualified plan
Defined Benefit Plan Disclosure [Line Items]
Expected 2017 contributions to be made by the Company		2		$ 2
Pre-tax benefit resulting from remeasurements
Defined Benefit Plan Disclosure [Line Items]
Pre-tax benefit	[1]	$ 24

[1] Represents adjustments to the net periodic pension cost resulting from remeasurements of certain Hewlett Packard Enterprise pension plans due to plan separations in connection with the spin-off and merger of Seattle SpinCo, Inc. with Micro Focus and Everett SpinCo, Inc. with Computer Sciences Corporation.