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Schedule of Net Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Income Tax Disclosure [Abstract]
Net current deferred tax assets	$ 89	$ 34
Deferred income taxes	15	12
Net non-current deferred tax liabilities	(66)	(32)
Net deferred tax assets	$ 38	$ 14

Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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