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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. 24, 2020
Jan. 25, 2019
Jan. 24, 2020
Jan. 25, 2019
Dividends, Common Stock [Abstract]        
Dividends per share declared $ 0.48 $ 0.40 $ 1.44 $ 1.20
Dividend payments     $ 334 $ 306
Additional Paid-in Capital        
Dividends, Common Stock [Abstract]        
Dividend payments     334 306
Retained Earnings        
Dividends, Common Stock [Abstract]        
Dividend payments     $ 0 $ 0