Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2020	Jul. 26, 2019	Apr. 24, 2020
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 317		$ 303
Revenue recognized that was previously included in deferred revenue	103	$ 98
Estimated revenue expected to be recognized in future periods related to unsatisfied performance obligations	$ 1,000
Period over which remaining performance obligations are expected to be recognized as revenue	four years
Other accrued expenses
Disaggregation of Revenue [Line Items]
Rebate obligations	$ 798		706
Deferred revenue	227		213
Reduction of accounts receivable
Disaggregation of Revenue [Line Items]
Rebate obligations	415		321
Other liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 90		$ 90