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

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

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Acquisitions (Details) $ in Millions					12 Months Ended
Acquisitions (Details) $ in Millions	Sep. 25, 2019 USD ($)	Apr. 17, 2017 USD ($)	Feb. 17, 2017 USD ($)	Nov. 01, 2016 USD ($)	Oct. 31, 2018 USD ($) business_acquired	Oct. 31, 2017 USD ($) business_acquired	Oct. 31, 2019 USD ($)
Acquisitions
Number of acquisitions \| business_acquired					3	6
Goodwill					$ 17,537	$ 17,516	$ 18,306
Cray Inc.
Acquisitions
Total fair value of consideration	$ 1,500
Goodwill	$ 699
Weighted-average useful life	4 years
Nimble Storage
Acquisitions
Total fair value of consideration		$ 1,200
Goodwill		760
Intangible assets		$ 291
Weighted-average useful life		5 years
SimpliVity
Acquisitions
Total fair value of consideration			$ 651
Goodwill			443
Intangible assets			$ 118
Weighted-average useful life			5 years
SGI
Acquisitions
Total fair value of consideration				$ 349
Goodwill				75
Intangible assets				$ 150
Weighted-average useful life				5 years
Intangible Assets \| Cray Inc.
Acquisitions
Intangible assets	$ 425
In-process research and development \| Cray Inc.
Acquisitions
Intangible assets	$ 141
In-process research and development \| Nimble Storage
Acquisitions
Intangible assets		$ 31
In-process research and development \| SimpliVity
Acquisitions
Intangible assets			$ 24
In-process research and development \| SGI
Acquisitions
Intangible assets				$ 30