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Goodwill and Intangible Assets (Goodwill Rollforward) (Details) (USD $)	3 Months Ended		12 Months Ended
	Apr. 03, 2015	May 02, 2014	Jan. 30, 2015
Goodwill [Roll Forward]
Beginning balance		$ 1,693,000,000us-gaap_Goodwill	$ 1,693,000,000us-gaap_Goodwill
Goodwill impairment charges	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	(486,000,000)us-gaap_GoodwillImpairmentLoss
Ending balance	1,207,000,000us-gaap_Goodwill		1,207,000,000us-gaap_Goodwill
NSS
Goodwill [Roll Forward]
Beginning balance		788,000,000	788,000,000
Goodwill impairment charges			0
Ending balance	788,000,000		788,000,000
HES
Goodwill [Roll Forward]
Beginning balance		905,000,000	905,000,000
Goodwill impairment charges			(486,000,000)
Ending balance	$ 419,000,000		$ 419,000,000