HPE Next (Details) - USD ($) $ in Millions	3 Months Ended
Jan. 31, 2019	Jan. 31, 2018	Oct. 31, 2018
Restructuring Cost and Reserve [Line Items]
Transformation costs	$ 78	$ 245
Current restructuring liability reported in Accrued restructuring	239		$ 294
Long-term portion of restructuring reserve, recorded in Other liabilities	26		31
HPE Next
Restructuring Cost and Reserve [Line Items]
Transformation costs	83	$ 245
Current restructuring liability reported in Accrued restructuring	193		241
Long-term portion of restructuring reserve, recorded in Other liabilities	60		$ 83
Transformation Costs [Member] \| HPE Next
Restructuring Cost and Reserve [Line Items]
Transformation costs	78
Non-Service Net Periodic Benefit Credit [Member] \| HPE Next
Restructuring Cost and Reserve [Line Items]
Transformation costs	$ 5

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b)(2))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Name:	us-gaap_RestructuringReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant