Stock-Based Compensation (Details) (USD $) In Millions	3 Months Ended
	Jul. 29, 2011	Jul. 30, 2010
Stock-Based Compensation [Line Items]
Stock-Based Compensation Expense	$ 41	$ 49
Stock-Based Compensation [Abstract]
Income tax benefits	(11)	(14)
Total stock-based compensation, net of tax	30	35
Employee Stock Option [Member]
Stock-Based Compensation [Line Items]
Stock-Based Compensation Expense	15	22
Restricted Stock Awards [Member]
Stock-Based Compensation [Line Items]
Stock-Based Compensation Expense	22	23
Employee Stock Purchase Plan [Member]
Stock-Based Compensation [Line Items]
Stock-Based Compensation Expense	4	4
Cost of Products Sold [Member]
Stock-Based Compensation [Line Items]
Stock-Based Compensation Expense	3	6
Research And Development Expense [Member]
Stock-Based Compensation [Line Items]
Stock-Based Compensation Expense	7	12
Selling, General And Administrative Expense [Member]
Stock-Based Compensation [Line Items]
Stock-Based Compensation Expense	$ 31	$ 31