Stockholders' Equity - Summary of Activities Related to Dividends on Common Stock (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jan. 29, 2021	Jan. 24, 2020	Jan. 29, 2021	Jan. 24, 2020
Dividends, Common Stock [Abstract]
Dividends per share declared	$ 0.48	$ 0.48	$ 1.44	$ 1.44
Dividend payments			$ 321	$ 334
Additional Paid-in Capital
Dividends, Common Stock [Abstract]
Dividend payments			30	334
Retained Earnings
Dividends, Common Stock [Abstract]
Dividend payments			$ 291	$ 0