Self Insurance (Summary Of Self Insurance Reserves) (Details) (USD $) In Millions, unless otherwise specified	Jan. 28, 2012	Jan. 29, 2011
Self Insurance [Line Items]
Self insurance reserve	$ 86	$ 79
Workers' Compensation [Member]
Self Insurance [Line Items]
Self insurance reserve	53	50
Employee Health And Welfare [Member]
Self Insurance [Line Items]
Self insurance reserve	19	18
General Liability [Member]
Self Insurance [Line Items]
Self insurance reserve	$ 14	$ 11

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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