Goodwill and Intangible Assets (Schedule of Intangible Assets Including Estimates of Assets Acquired) (Detail) (USD $) In Millions, unless otherwise specified	Nov. 01, 2013	Jan. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 186	$ 252
Total intangible assets, Gross carrying value	200	266
Accumulated amortization	(100)	(88)
Net carrying value	86	164
Total intangible assets, Net carrying value	100	178
Indefinite-lived intangible assets	14	14
In-Process Research And Development
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	10	10
Trade Names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	4	4
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	116	154
Accumulated amortization	(64)	(57)
Net carrying value	52	97
Software and Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	66	97
Accumulated amortization	(35)	(30)
Net carrying value	31	67
Other
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	4	1
Accumulated amortization	(1)	(1)
Net carrying value	$ 3	$ 0