Goodwill and Purchased Intangible Assets, Net - Purchased Intangible Assets, Net (Detail) - USD ($) $ in Millions	Jul. 26, 2019	Apr. 26, 2019
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	$ 186	$ 201
Accumulated Amortization	(124)	(154)
Net Assets	62	47
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	186	160
Accumulated Amortization	(124)	(113)
Net Assets	62	47
Customer Contracts/Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	0	41
Accumulated Amortization	0	(41)
Net Assets	$ 0	$ 0