Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
Apr. 24, 2020	Apr. 26, 2019	Apr. 27, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current, Federal	$ 83	$ 26	$ 764
Current, State	9	27	10
Current, Foreign	50	49	39
Total current	142	102	813
Deferred, Federal	(26)	35	239
Deferred, State	(6)	(6)	27
Deferred, Foreign	15	(32)	4
Total deferred	(17)	(3)	270
Provision for income taxes	$ 125	$ 99	$ 1,083

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