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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. 25, 2019
Jan. 26, 2018
Jan. 25, 2019
Jan. 26, 2018
Dividends, Common Stock [Abstract]        
Dividends per share declared $ 0.40 $ 0.20 $ 1.20 $ 0.60
Dividend payments     $ 306 $ 161
Additional Paid-in Capital        
Dividends, Common Stock [Abstract]        
Dividend payments     306 53
Retained Earnings (Accumulated Deficit)        
Dividends, Common Stock [Abstract]        
Dividend payments     $ 0 $ 108