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Segment Information - Reconciliation of Segment Assets (Details) - USD ($) $ in Millions	Jan. 31, 2020	Oct. 31, 2019
Segment Reporting Information [Line Items]
Assets	$ 52,244	$ 51,803
Operating Segment | Compute
Segment Reporting Information [Line Items]
Assets	14,159	14,066
Operating Segment | HPC & MCS
Segment Reporting Information [Line Items]
Assets	6,568	6,819
Operating Segment | Storage
Segment Reporting Information [Line Items]
Assets	6,848	7,214
Operating Segment | A & PS
Segment Reporting Information [Line Items]
Assets	455	440
Operating Segment | Intelligent Edge
Segment Reporting Information [Line Items]
Assets	3,338	3,318
Operating Segment | Financial Services
Segment Reporting Information [Line Items]
Assets	14,610	14,700
Operating Segment | Corporate Investments
Segment Reporting Information [Line Items]
Assets	438	461
Corporate and unallocated assets
Segment Reporting Information [Line Items]
Assets	$ 5,828	$ 4,785

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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