Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended
	Jul. 27, 2018	Jul. 28, 2017
Disaggregation Of Revenue [Line Items]
Net revenues	$ 1,474	$ 1,321
Product Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	875	727
Strategic
Disaggregation Of Revenue [Line Items]
Net revenues	612	498
Mature
Disaggregation Of Revenue [Line Items]
Net revenues	263	229
Software Maintenance Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	229	223
Hardware Maintenance and Other Services Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	370	371
Hardware Maintenance Support Contracts
Disaggregation Of Revenue [Line Items]
Net revenues	303	298
Professional and Other Services
Disaggregation Of Revenue [Line Items]
Net revenues	$ 67	$ 73