Stock Purchase and Award Plans , Stock Options Activity (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
Stock Options Activities (in shares)
Beginning balance	35,577
Granted	40,952
Exercised	(13,503)
Expired/Forfeited	(1,005)
Outstanding at year-end	62,021	35,577
Options, Vested and expected to vest	55,649
Options, Exercisable	28,272
Stock Options Activities (per share)
Beginning Balance	$ 44.78
Granted	57.96
Exercised	45.32
Expired/Forfeited	50.43
Outstanding at year-end	53.27	$ 44.78
Weighted Average Exercise Price, Vested and expected to vest	51.27
Weighted Average Exercise Price, Exercisable	$ 39.91
Weighted Average Remaining Contractual Term, Outstanding	7 years 11 days
Weighted Average Remaining Contractual Term, Vested and expected to vest	6 years 9 months
Weighted Average Remaining Contractual Term, Exercisable	4 years 6 months 11 days
Aggregate Intrinsic Value, Outstanding	$ 1,351
Aggregate Intrinsic Value, Vested and expected to vest	1,314
Aggregate Intrinsic Value, Exercisable	981
Cash received from the exercise of stock options	609	$ 1,273	$ 230
Total intrinsic value of options exercised	329	249	39
Tax benefit related to options exercised	$ 106	$ 78	$ 12