BUSINESS COMBINATIONS, GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details) $ in Millions	6 Months Ended
Jul. 31, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 41,691
Goodwill acquired	218
Impact of foreign currency translation	118
Reclassification to assets held for sale	(1,383)
Goodwill	40,644
Infrastructure Solutions Group
Goodwill [Roll Forward]
Goodwill	15,089
Goodwill acquired	0
Impact of foreign currency translation	111
Reclassification to assets held for sale	0
Goodwill	15,200
Client Solutions Group
Goodwill [Roll Forward]
Goodwill	4,237
Goodwill acquired	0
Impact of foreign currency translation	0
Reclassification to assets held for sale	0
Goodwill	4,237
VMware
Goodwill [Roll Forward]
Goodwill	20,532
Goodwill acquired	218
Impact of foreign currency translation	0
Reclassification to assets held for sale	0
Goodwill	20,750
Other Businesses
Goodwill [Roll Forward]
Goodwill	1,833
Goodwill acquired	0
Impact of foreign currency translation	7
Reclassification to assets held for sale	(1,383)
Goodwill	$ 457

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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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.

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Amount of divestiture 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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