Balance Sheet Details - Property and Equipment Net (Detail) - USD ($) $ in Millions	Jul. 31, 2015	Apr. 24, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,231	$ 2,223
Accumulated depreciation and amortization	(1,220)	(1,193)
Property and equipment, net	1,011	1,030
Land
Property Plant And Equipment [Line Items]
Property and equipment, gross	265	265
Buildings and improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	606	607
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	109	107
Computer, production, engineering and other equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	759	754
Computer software
Property Plant And Equipment [Line Items]
Property and equipment, gross	369	372
Furniture and fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	85	85
Construction-in-progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 38	$ 33