Share Repurchase (Details) (USD $) Share data in Millions, except Per Share data	3 Months Ended	6 Months Ended	12 Months Ended
Jul. 30, 2011	Apr. 30, 2011	Jul. 31, 2010	May 01, 2010	Jul. 30, 2011	Jul. 31, 2010	Jan. 29, 2011
Share Repurchase Information
Amount approved by board of directors for share repurchase program					$ 10,000,000,000
Total Number of Shares Purchased (in shares)	14.3	15.4	17.6	7.5	29.7	25.1
Repurchase of stock, average price per share (in dollars per share)	$ 48.11	$ 53.32	$ 51.72	$ 52.27	$ 50.81	$ 51.89
Total Investment	688,000,000	819,000,000	907,000,000	394,000,000	1,507,000,000	1,301,000,000
Stock repurchased, delivered upon settlement of prepaid forward contracts (in shares)	0.2	0.1		0.3	0.3	0.3
Repurchase of stock					1,507,000,000		2,514,000,000
Cash investment
Share Repurchase Information
Repurchase of stock	7,000,000	7,000,000		15,000,000	14,000,000	15,000,000
Prepaid forward contracts market value
Share Repurchase Information
Stock repurchased, delivered upon settlement of prepaid forward contracts	$ 7,000,000	$ 7,000,000		$ 16,000,000	$ 14,000,000	$ 16,000,000

This element represents the amount of total investment in stock repurchased and retired during the period which was acquired through the open market transactions.

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- Definition

The amount of stock repurchased during the period which was delivered upon settlement of prepaid forward contracts.

+ Details

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- Definition

Number of shares repurchased during the period that were delivered upon settlement of prepaid forward contracts.

+ Details

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- Details

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

+ Details

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7
-Subparagraph b
-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 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

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