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Income Taxes - Income Before Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 27, 2018
Apr. 28, 2017
Apr. 29, 2016
Income Tax Disclosure [Abstract]      
Domestic $ 565 $ 206 $ 88
Foreign 601 459 257
Income before income taxes $ 1,166 $ 665 $ 345