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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- Definition

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

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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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- Definition

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

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Acquisitions - Narrative (Details) $ in Millions				9 Months Ended
Acquisitions - Narrative (Details) $ in Millions	Apr. 17, 2017 USD ($)	Feb. 17, 2017 USD ($)	Nov. 01, 2016 USD ($)	Jul. 31, 2017 USD ($) business_acquired	Oct. 31, 2016 USD ($)
Business Combinations [Abstract]
Number of businesses acquired \| business_acquired				5
Business Acquisition [Line Items]
Goodwill				$ 25,491	$ 24,178
Nimble Storage
Business Acquisition [Line Items]
Consideration	$ 1,200
Goodwill	761
Amortizable intangible assets	$ 289
Estimated weighted-average useful life	5 years
Nimble Storage \| In-process research and development
Business Acquisition [Line Items]
Amortizable intangible assets	$ 31
SimpliVity
Business Acquisition [Line Items]
Consideration		$ 651
Goodwill		445
Amortizable intangible assets		$ 118
Estimated weighted-average useful life		5 years
SimpliVity \| In-process research and development
Business Acquisition [Line Items]
Amortizable intangible assets		$ 24
SGI
Business Acquisition [Line Items]
Consideration			$ 349
Goodwill			74
Amortizable intangible assets			$ 150
Estimated weighted-average useful life			5 years
SGI \| In-process research and development
Business Acquisition [Line Items]
Amortizable intangible assets			$ 30