Derivatives and Currency Exchange Risk Management - Schedule of Amounts Recorded on Consolidated Balance Sheet Related to Cumulative Basis Adjustments for Fair Value Hedges (Details) - Long-term debt - USD ($) $ in Millions	Jan. 24, 2020	Apr. 26, 2019
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Assets/(Liabilities)	$ 0	$ (1,175)
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	$ 0	$ 9