Derivatives and Currency Exchange Risk Management - Classification and Fair Value Amounts of Derivative Instruments in Balance Sheets (Details) - USD ($) $ in Millions	Jul. 31, 2020	Apr. 24, 2020
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 140	$ 402
Derivative Liabilities, Fair Value	192	42
Currency exchange rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	137	399
Derivative Liabilities, Fair Value	192	17
Total return swaps
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	1
Derivative Liabilities, Fair Value		25
Cross-currency interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	2	3
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	67	374
Derivative Liabilities, Fair Value	117	4
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	59	271
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	8	103
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	60	2
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	57	2
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	73	28
Derivative Liabilities, Fair Value	75	38
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	70	25
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	75	13
Derivatives not designated as hedging instruments | Total return swaps | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	1	0
Derivatives not designated as hedging instruments | Total return swaps | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	0	25
Derivatives not designated as hedging instruments | Cross-currency interest rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	2	3
Derivatives not designated as hedging instruments | Cross-currency interest rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	$ 0	$ 0