Stockholders' Equity - Summary of Activities Related to Dividends on Common Stock (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Apr. 30, 2021	Apr. 24, 2020	Apr. 26, 2019
Dividends, Common Stock [Abstract]
Dividends per share declared	$ 1.92	$ 1.92	$ 1.60
Dividend payments	$ 427	$ 439	$ 403
Additional Paid-in Capital
Dividends, Common Stock [Abstract]
Dividend payments	30	400	403
Retained Earnings
Dividends, Common Stock [Abstract]
Dividend payments	$ 397	$ 39	$ 0