Stock Purchase and Award Plans , Stock Options Activity (Details) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Options
Outstanding at beginning of period (in shares)	41,039
Granted (in shares)	5,407
Exercised (in shares)	(13,767)
Expired/Forfeited (in shares)	(1,002)
Outstanding at end of period (in shares)	31,677	41,039
Options, Vested and expected to vest (in shares)	9,086
Options, Exercisable (in shares)	22,102
Wtd. Avg. Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 66.56
Granted (in dollars per share)	89.05
Exercised (in dollars per share)	62.76
Expired/Forfeited (in dollars per share)	83.17
Outstanding at end of period (in dollars per share)	71.52	$ 66.56
Weighted Average Exercise Price, Vested and expected to vest (in dollars per share)	86.54
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 65.01
Additional Disclosures
Weighted Average Remaining Contractual Term, Outstanding	5 years 10 months 28 days
Weighted Average Remaining Contractual Term, Vested and expected to vest	8 years 5 months 15 days
Weighted Average Remaining Contractual Term, Exercisable	4 years 9 months 21 days
Aggregate Intrinsic Value, Outstanding	$ 512
Aggregate Intrinsic Value, Vested and expected to vest	16
Aggregate Intrinsic Value, Exercisable	495
Cash proceeds from options exercised	825	$ 250	$ 367
Intrinsic value of options exercised	383	248	403
Tax benefit related to options exercised	$ 78	$ 75	$ 140