Acquisitions and Acquisition-Related Items (Contingent Consideration) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Oct. 28, 2011	Oct. 29, 2010	Oct. 28, 2011	Oct. 29, 2010
Business Acquisition, Contingent Consideration, at Fair Value [Roll Forward]
Beginning Balance	$ 343	$ 120	$ 335	$ 118
Purchase price contingent consideration	2	16	2	16
Contingent milestone payments	(66)	0	(66)	0
Change in fair value of contingent consideration	9	0	17	2
Ending Balance	$ 288	$ 136	$ 288	$ 136

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

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+ Details