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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
Jul. 27, 2018
Jul. 28, 2017
Dividends, Common Stock [Abstract]    
Dividends per share declared $ 0.40 $ 0.20
Dividend payments $ 105 $ 54
Additional Paid-in Capital    
Dividends, Common Stock [Abstract]    
Dividend payments 105 0
Retained Earnings (Accumulated Deficit)    
Dividends, Common Stock [Abstract]    
Dividend payments $ 0 $ 54