The amount of net tangible assets recognized as of the acquisition date.

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Number of divestitures completed or in the process attributable to disposal group, including but not limited to, discontinued operation.

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Percentage of ownership of existing businesses by the entity.

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Represents the parent entity's interest in the subsidiary, as a percentage.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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No definition available.

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No definition available.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The number of businesses acquired by the entity during the period.

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No definition available.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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This element represents the cash inflow during the period from the sale of a component of the entity.

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Acquisitions and Divestitures (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
Acquisitions and Divestitures (Details) $ in Millions	May. 31, 2015 USD ($)	Jan. 31, 2016 USD ($)	Oct. 31, 2015 USD ($) item	Oct. 31, 2014 USD ($) item	Oct. 31, 2013 USD ($)
Acquisitions
Goodwill			$ 32,941	$ 31,139	$ 31,124
Divestitures
Proceeds from business divestitures			246	$ 6
Aruba
Acquisitions
Total fair value of consideration	$ 2,800
Goodwill	1,800
Intangible assets	$ 643
Weighted-average useful life	6 years
Aruba \| In-process research and development
Acquisitions
Intangible assets	$ 153		$ 153
Acquisitions in prior year
Acquisitions:
Number of acquisitions \| item				2
Acquisitions
Total fair value of consideration				$ 55
Goodwill				12
Intangible assets				$ 25
Aggregate purchase price allocation
Acquisitions:
Number of acquisitions \| item			5
Acquisitions
Total fair value of consideration			$ 3,071
Goodwill			1,987
Intangible assets			704
Net assets assumed			221
Aggregate purchase price allocation \| In-process research and development
Acquisitions
Net tangible assets			$ 159
Non-core divestitures \| Disposal groups
Divestitures
Number of divestitures \| item			5
Proceeds from business divestitures			$ 246
Non-core divestitures \| Trend Micro International \| Forecast
Divestitures
Proceeds from business divestitures		$ 300
Disposal Group Disposed of by Other than Sale Not Discontinued Operations Spinoff \| H3C \| Hewlett Packard Enterprise China businesses
Divestitures
Entity ownership of Hewlett Packard Enterprise China businesses (as a percent)		100.00%
Disposal Group Disposed of by Other than Sale Not Discontinued Operations Spinoff \| Tsinghua Holdings Subsidiary \| H3C
Divestitures
Interest acquired (as a percent)		51.00%
Proceeds from divestiture of businesses		$ 2,300