Fair Value Derivative Contracts on Gross Basis by Type of Contract (Detail) (Diesel fuel forward contracts, USD $) In Millions, unless otherwise specified	May 02, 2015	Jan. 31, 2015	May 03, 2014
Derivatives Designated as Hedging Instruments
Derivative [Line Items]
Fair value of derivative liability	$ 5	$ 4	$ 1
Derivatives Designated as Non-Hedging Instruments
Derivative [Line Items]
Fair value of derivative liability	$ 0	$ 1	$ 1

Fair value as of the balance sheet date of all foreign currency derivative liabilities designated as cash flow hedging instruments.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

Name:	us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant