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Goodwill (Details)	3 Months Ended
	Jan. 31, 2020 USD ($) segment	Oct. 31, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill beginning balance	$ 18,306,000,000
Goodwill adjustments	(1,000,000)
Goodwill ending balance	18,305,000,000
Goodwill	$ 18,305,000,000
Number of segments | segment	7
Compute
Goodwill [Roll Forward]
Goodwill beginning balance	$ 7,532,000,000
Goodwill adjustments	0
Goodwill ending balance	7,532,000,000
Goodwill	7,532,000,000
HPC & MCS
Goodwill [Roll Forward]
Goodwill beginning balance	4,478,000,000
Goodwill adjustments	0
Goodwill ending balance	4,478,000,000
Goodwill	4,478,000,000
Storage
Goodwill [Roll Forward]
Goodwill beginning balance	4,158,000,000
Goodwill adjustments	(1,000,000)
Goodwill ending balance	4,157,000,000
Goodwill	4,157,000,000
Intelligent Edge
Goodwill [Roll Forward]
Goodwill beginning balance	1,994,000,000
Goodwill adjustments	0
Goodwill ending balance	1,994,000,000
Goodwill	1,994,000,000
Financial Services
Goodwill [Roll Forward]
Goodwill beginning balance	144,000,000
Goodwill adjustments	0
Goodwill ending balance	144,000,000
Goodwill	144,000,000
Corporate Investments
Goodwill [Roll Forward]
Goodwill ending balance	0
Goodwill	$ 0	$ 88,000,000

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460

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-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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