Income Taxes - Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 27, 2018	Apr. 28, 2017	Apr. 29, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax computed at federal statutory rate	$ 356	$ 233	$ 121
State income taxes, net of federal benefit	17	9	(4)
Foreign earnings in lower tax jurisdictions	(108)	(100)	(81)
Stock-based compensation	(23)	16	13
Research and development credits	(10)	(8)	(14)
Resolution of income tax examinations	0	0	20
Domestic production activities deduction	(7)	(4)	(10)
Tax rate changes	126	5	1
Transition tax	732	0	0
Other	7	5	6
Provision for income taxes	1,090	156	116
SolidFire
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax charge from integration of intellectual properties from the SolidFire acquisition	$ 0	$ 0	$ 64