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Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 27, 2018	Apr. 28, 2017	Apr. 29, 2016
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current, Federal	$ 764	$ 22	$ 180
Current, State	10	3	14
Current, Foreign	39	41	35
Total current	813	66	229
Deferred, Federal	250	75	(91)
Deferred, State	26	18	(17)
Deferred, Foreign	1	(3)	(5)
Total deferred	277	90	(113)
Provision for income taxes	$ 1,090	$ 156	$ 116

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