The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended		6 Months Ended	12 Months Ended
	Apr. 14, 2011	Dec. 05, 2010	Jul. 31, 2011	Jan. 30, 2011
Commitments And Contingencies
Settlement of claims to litigation agreed for payment		$ 20
Additional legal charge				10
Total legal accrued liabilities				20
Payments for settlement	$ 20
Number of class action lawsuits filed			2