Stock Purchase and Award Plans , Stock Options Activity (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Apr. 27, 2018	Apr. 28, 2017	Apr. 29, 2016
Options
Outstanding at beginning of period (in shares)	45,194
Granted (in shares)	3,773
Exercised (in shares)	(6,145)
Expired/Forfeited (in shares)	(1,783)
Outstanding at end of period (in shares)	41,039	45,194
Options, Vested and expected to vest (in shares)	23,093
Options, Exercisable (in shares)	17,136
Wtd. Avg. Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 62.41
Granted (in dollars per share)	83.92
Exercised (in dollars per share)	43.72
Expired/Forfeited (in dollars per share)	76.93
Outstanding at end of period (in dollars per share)	66.56	$ 62.41
Weighted Average Exercise Price, Vested and expected to vest (in dollars per share)	77.30
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 51.43
Additional Disclosures
Weighted Average Remaining Contractual Term, Outstanding	5 years 11 months 9 days
Weighted Average Remaining Contractual Term, Vested and expected to vest	7 years 1 month 13 days
Weighted Average Remaining Contractual Term, Exercisable	4 years 3 months
Aggregate Intrinsic Value, Outstanding	$ 637
Aggregate Intrinsic Value, Vested and expected to vest	115
Aggregate Intrinsic Value, Exercisable	520
Cash proceeds from options exercised	250	$ 367	$ 452
Intrinsic value of options exercised	248	403	374
Tax benefit related to options exercised	$ 75	$ 140	$ 131