Acquisitions and Acquisition-Related Items (Contingent Consideration) (Details) (USD $) In Millions	3 Months Ended	12 Months Ended
Jan. 28, 2011	Apr. 29, 2011	Apr. 30, 2010
Acquisitions [Abstract]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	$ 81
Business Acquisition, Contingent Consideration Included in Long-term Liabilities		269
Business Acquisition, Contingent Consideration Included in Short-term Liabilities		66
Business Acquisition, Contingent Consideration, at Fair Value [Roll Forward]
Beginning Balance		118
Purchase price contingent consideration		203	118
Change in Fair Value of Contingent Consideration		14
Ending Balance		$ 335	$ 118

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- Definition

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares as reported in long-term liabilities.

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- Definition

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares as reported in short-term liabilities.

+ Details

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- Definition

Amount of contingent consideration arrangement resulting from business combinations.

+ Details

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- Definition

This element represents the amount of any change in fair value in th econtingent consideration liabilities, recognized during the reporting period.

+ Details

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- Definition

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph g(1)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph f

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 29, 30, 41, 42, 64

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 65
-Subparagraph a, b

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- Definition

This element represents the amount of any change, including any differences arising upon settlement, recognized during the reporting period in the value of a liability, arising from an item of contingent consideration, assumed in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 23, 24, 25

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph b(1)

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