Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair Value of Derivative Contracts on Gross Basis, by Type of Contract (Detail) (Diesel fuel forward contracts, USD $) In Millions, unless otherwise specified	May 04, 2013 Derivatives Designated as Hedging Instruments Current Assets	Feb. 02, 2013 Derivatives Designated as Hedging Instruments Current Assets	Apr. 28, 2012 Derivatives Designated as Hedging Instruments Current Liabilities	May 04, 2013 Derivatives Designated as Non-Hedging Instruments Current Assets	Feb. 02, 2013 Derivatives Designated as Non-Hedging Instruments Current Assets
Derivative [Line Items]
Fair value of derivative asset	$ 2	$ 4
Fair value of derivative liability			2
Fair value of derivative asset				$ 1	$ 2