Amount of loss from the write-down 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

Goodwill and Intangible Assets (Goodwill Rollforward) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Aug. 01, 2014	Jul. 03, 2015	Aug. 01, 2014	Jan. 30, 2015
Goodwill [Roll Forward]
Beginning balance			$ 1,693	$ 1,693
Goodwill impairment charges	$ (486)	$ 0	(486)	(486)
Ending balance		1,207		1,207
NSS
Goodwill [Roll Forward]
Beginning balance			788	788
Goodwill impairment charges				0
Ending balance		788		788
HES
Goodwill [Roll Forward]
Beginning balance			$ 905	905
Goodwill impairment charges				(486)
Ending balance		$ 419		$ 419