Stock Purchase and Award Plans, Stock Options Activity (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010
Stock Options Activities (in shares)
Beginning balance	84,652	89,613	93,394
Granted	4,634	6,371	7,863
Exercised	(1,218)	(627)	(3,126)
Canceled	(13,478)	(10,705)	(8,518)
Outstanding at year-end	74,590	84,652	89,613
Exercisable at year-end	60,833	66,286	67,944
Stock Options Activities (per share)
Beginning Balance	$ 45.23	$ 46.13	$ 46.57
Granted	$ 34.93	$ 37.59	$ 35.81
Exercised	$ 34.95	$ 32.84	$ 32.96
Canceled	$ 44.98	$ 48.91	$ 46.27
Outstanding at year-end	$ 44.80	$ 45.23	$ 46.13
Exercisable at year-end	$ 46.73	$ 47.24	$ 48.24
Weighted average remaining contractual life for options outstanding	4 years 6 months
Weighted average remaining contractual life for options exercisable	3 years 8 months
Total intrinsic value of options exercised	$ 5	$ 4	$ 19
Intrinsic value of in-the-money options outstanding	44
Intrinsic value of in-the-money options exercisable	22
Cash received from the exercise of stock options	43
Tax benefit from stock options exercised	2
Unrecognized compensation expense related to outstanding stock options	$ 63
Weighted average period over which unrecognized compensation is expected to be recognized	1 year 1 month