Goodwill and Purchased Intangible Assets, Net - Purchased Intangible Assets, Net (Detail) - USD ($) $ in Millions	Jul. 31, 2020	Apr. 24, 2020
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	$ 256	$ 196
Accumulated Amortization	(116)	(152)
Net Assets	140	44
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	215	192
Accumulated Amortization	(116)	(152)
Net Assets	99	40
Customer Contracts/Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	38	4
Accumulated Amortization	0	0
Net Assets	38	4
Other Purchased Intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	3	0
Accumulated Amortization	0	0
Net Assets	$ 3	$ 0