Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Chapter 1

-Section B

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Share Repurchase Programs (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended				3 Months Ended	9 Months Ended
	Apr. 29, 2012	May 01, 2011	Apr. 29, 2012 Capital Stock In Treasury [Member]	May 01, 2011 Capital Stock In Treasury [Member]	Jul. 31, 2011 June 2011 Program [Member]	Apr. 29, 2012 June 2011 Program [Member]	Apr. 29, 2012 June 2011 Program [Member] Capital Stock In Treasury [Member]	May 01, 2011 June 2008 Program [Member] Capital Stock In Treasury [Member]
Equity, Class of Treasury Stock [Line Items]
Authorized amount for shares repurchase					$ 1,000
Shares repurchased, shares			8	20
Shares repurchased, value	272	696	272	696			181	543
Amount available for share repurchase program						$ 819