Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current, Federal	$ 26	$ 764	$ 22
Current, State	27	10	3
Current, Foreign	49	39	41
Total current	102	813	66
Deferred, Federal	35	239	61
Deferred, State	(6)	27	17
Deferred, Foreign	(32)	4	(4)
Total deferred	(3)	270	74
Provision for income taxes	$ 99	$ 1,083	$ 140

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