Revenue - Summary of Disaggregation of Revenue (Detail) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2020	Jul. 26, 2019
Disaggregation Of Revenue [Line Items]
Net revenues	$ 1,303	$ 1,236
Product Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	627	644
Software Maintenance Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	301	250
Hardware Maintenance and Other Services Revenues
Disaggregation Of Revenue [Line Items]
Net revenues	375	342
Hardware Maintenance Support Contracts
Disaggregation Of Revenue [Line Items]
Net revenues	307	284
Professional and Other Services
Disaggregation Of Revenue [Line Items]
Net revenues	$ 68	$ 58