Stockholders' Equity (Details) (USD $)	6 Months Ended
Jul. 31, 2011
Notes to financial statements [Abstract]
Aggregate maximum amount of common stock to be repurchased	$ 2,700,000,000.0
Aggregate number of shares repurchased under stock repurchase program (in shares)	90,900,000.0
Cost of shares repurchased under stock repurchase program	1,460,000,000.00
Authorized cost of shares to be repurchased	$ 1,240,000,000.00
Authorized number of shares of common stock (in shares)	2,000,000,000
Par value of common stock	$ 0.001

Aggregate maximum value of shares of common stock eligible for repurchase under stock repurchase program.

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- Definition

Aggregate number of common stock repurchased under stock repurchase program.

+ Details

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- Definition

Authorized remaining value of additional shares of common stock that could be repurchased under the stock repurchase program.

+ Details

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- Definition

Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

+ Details

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7
-Subparagraph b

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