Revenue - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Jan. 24, 2020	Apr. 26, 2019
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 303	$ 315
Revenue recognized that was previously included in deferred revenue	192
Estimated revenue expected to be recognized in future periods related to unsatisfied performance obligations	$ 1,200
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	$ 862	764
Deferred revenue	212	211
Reduction of accounts receivable
Disaggregation of Revenue [Line Items]
Rebate obligations	447	432
Other liabilities
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 91	$ 104