Schedule of Intangible Assets Including Estimates of Assets Acquired (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 171	$ 252
Accumulated amortization	(91)	(88)
Net carrying value	80	164
Indefinite-lived intangible assets	14	14
Total intangible assets, Gross carrying value	185	266
Total intangible assets, Net carrying value	94	178
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	102	154
Accumulated amortization	(54)	(57)
Net carrying value	48	97
Software and Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	65	97
Accumulated amortization	(36)	(30)
Net carrying value	29	67
Other
Finite-Lived Intangible Assets [Line Items]
Gross carrying value	4	1
Accumulated amortization	(1)	(1)
Net carrying value	$ 3	$ 0