GOODWILL AND INTANGIBLE ASSETS - Intangible Assets - Write-offs (Details) $ in Millions	12 Months Ended
Jan. 31, 2016 USD ($)
Intangible assets
Write-off amount	$ 671
Customer Relationships
Intangible assets
Write-off amount	668
Trade Names and Other intangible assets
Intangible assets
Write-off amount	$ 3

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275

Name:	us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration