Stock Purchase and Award Plans , Stock Options Activity (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Apr. 28, 2017	Apr. 29, 2016	Apr. 24, 2015
Stock Option Activity
Outstanding (in shares)	52,970
Granted (in shares)	4,061
Exercised (in shares)	(9,488)
Expired/Forfeited (in shares)	(2,349)
Outstanding (in shares)	45,194	52,970
Options, Vested and expected to vest (in shares)	22,929
Options, Exercisable (in shares)	19,138
Stock Option Activity
Outstanding (in dollars per share)	$ 57.09
Granted (in dollars per share)	87.35
Exercised (in dollars per share)	40.56
Expired/Forfeited (in dollars per share)	73.90
Outstanding (in dollars per share)	62.41	$ 57.09
Weighted Average Exercise Price, Vested and expected to vest (in dollars per share)	75.32
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 44.71
Weighted Average Remaining Contractual Term, Outstanding	6 years 3 months 20 days
Weighted Average Remaining Contractual Term, Vested and expected to vest	7 years 10 months 21 days
Weighted Average Remaining Contractual Term, Exercisable	4 years 1 month 20 days
Aggregate Intrinsic Value, Outstanding	$ 952
Aggregate Intrinsic Value, Vested and expected to vest	194
Aggregate Intrinsic Value, Exercisable	735
Cash proceeds from options exercised	367	$ 452	$ 609
Intrinsic value of options exercised	403	374	329
Tax benefit related to options exercised	$ 140	$ 131	$ 106