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, 2020	Apr. 26, 2019	Apr. 27, 2018
Options
Outstanding at beginning of period (in shares)	31,677
Granted (in shares)	4,349
Exercised (in shares)	(8,165)
Expired/Forfeited (in shares)	(793)
Outstanding at end of period (in shares)	27,068	31,677
Options, Expected to vest (in shares)	8,742
Options, Exercisable (in shares)	17,878
Wtd. Avg. Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 71.52
Granted (in dollars per share)	103.26
Exercised (in dollars per share)	62.49
Expired/Forfeited (in dollars per share)	90.74
Outstanding at end of period (in dollars per share)	78.70	$ 71.52
Weighted Average Exercise Price, Expected to vest (in dollars per share)	94.12
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 70.70
Additional Disclosures
Weighted Average Remaining Contractual Term, Outstanding	5 years 10 months 24 days
Weighted Average Remaining Contractual Term, Expected to vest	8 years 4 months 24 days
Weighted Average Remaining Contractual Term, Exercisable	4 years 6 months
Aggregate Intrinsic Value, Outstanding	$ 574
Aggregate Intrinsic Value, Expected to vest	60
Aggregate Intrinsic Value, Exercisable	512
Cash proceeds from options exercised	484	$ 825	$ 250
Intrinsic value of options exercised	349	383	248
Tax benefit related to options exercised	$ 75	$ 78	$ 75