Purchased Intangible Assets, Net - Purchased Intangible Assets, Net (Detail) - USD ($) $ in Millions	Jan. 27, 2017	Apr. 29, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	$ 200	$ 478
Accumulated Amortization	(55)	(298)
Net Assets	145	180
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	148	403
Accumulated Amortization	(36)	(289)
Net Assets	112	114
Customer Contracts/Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	43	46
Accumulated Amortization	(15)	(7)
Net Assets	28	39
Other Purchased Intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	9	10
Accumulated Amortization	(4)	(2)
Net Assets	5	8
Intangible Assets Subject to Amortization
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	200	459
Accumulated Amortization	(55)	(298)
Net Assets	145	161
In Process Research and Development
Acquired Finite Lived Intangible Assets [Line Items]
Gross Assets	0	19
Accumulated Amortization	0	0
Net Assets	$ 0	$ 19