Acquisitions and Acquisition-Related Items, Contingent Consideration (Details) (Level 3, USD $) In Millions, unless otherwise specified	3 Months Ended
Jul. 27, 2012	Jul. 29, 2011
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Beginning Balance	$ 231	$ 335
Purchase price contingent consideration	5	0
Contingent milestone payments	(26)	0
Change in fair value of contingent consideration	5	8
Ending Balance	215	343
Recurring \| Revenue-based Payments \| Minimum
Fair Value Inputs
Discount rate	13.00%
Probability of payment	25.00%
Projected fiscal year of payment	2013
Recurring \| Revenue-based Payments \| Maximum
Fair Value Inputs
Discount rate	24.00%
Probability of payment	100.00%
Projected fiscal year of payment	2019
Recurring \| Revenue-based Payments \| Discounted Cash Flow
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Ending Balance	210
Recurring \| Product Development-based Payments
Fair Value Inputs
Discount rate	5.90%
Probability of payment	100.00%
Projected fiscal year of payment	2013
Recurring \| Product Development-based Payments \| Discounted Cash Flow
Reconciliation of Beginning and Ending Balances of Contingent Milestone Payments Associated with Acquisitions
Ending Balance	$ 5

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

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+ Details