Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended
	Jul. 26, 2019	Jul. 27, 2018
Disaggregation Of Revenue [Line Items]
Net revenues	$ 1,236	$ 1,474
Product Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	644	875
Strategic
Disaggregation Of Revenue [Line Items]
Net revenues	337	475
Mature
Disaggregation Of Revenue [Line Items]
Net revenues	307	400
Software Maintenance Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	250	229
Hardware Maintenance and Other Services Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	342	370
Hardware Maintenance Support Contracts
Disaggregation Of Revenue [Line Items]
Net revenues	284	303
Professional and Other Services
Disaggregation Of Revenue [Line Items]
Net revenues	$ 58	$ 67