Goodwill - Schedule of Allocation and Changes in the Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
Jul. 31, 2018 USD ($)
Goodwill [Roll Forward]
Goodwill beginning balance	$ 17,516
Goodwill acquired during the period	105
Changes due to foreign currency	(1)
Goodwill adjustments	6
Goodwill ending balance	17,626
Hybrid IT
Goodwill [Roll Forward]
Goodwill beginning balance	15,454
Goodwill acquired during the period	102
Changes due to foreign currency	(1)
Goodwill adjustments	6
Goodwill ending balance	15,561
Intelligent Edge
Goodwill [Roll Forward]
Goodwill beginning balance	1,918
Goodwill acquired during the period	3
Changes due to foreign currency	0
Goodwill adjustments	0
Goodwill ending balance	1,921
Financial Services
Goodwill [Roll Forward]
Goodwill beginning balance	144
Goodwill acquired during the period	0
Changes due to foreign currency	0
Goodwill adjustments	0
Goodwill ending balance	$ 144

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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