Derivatives and Currency Exchange Risk Management - Classification and Fair Value Amounts of Derivative Instruments in Balance Sheets (Details) - USD ($) $ in Millions	Apr. 24, 2020	Apr. 26, 2019
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 402	$ 365
Derivative Liabilities	42	19
Currency exchange rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	399	335
Derivative Liabilities	17	19
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets		9
Total return swaps
Derivatives, Fair Value [Line Items]
Derivative Assets		15
Derivative Liabilities	25
Cross-currency interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	3	6
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	374	321
Derivative Liabilities	4	2
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	271	234
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	103	78
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	2	1
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	2	1
Derivatives designated as hedging instruments | Interest rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets		9
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities		0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	28	44
Derivative Liabilities	38	17
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	25	23
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	13	17
Derivatives not designated as hedging instruments | Total return swaps | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	0	15
Derivatives not designated as hedging instruments | Total return swaps | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	25	0
Derivatives not designated as hedging instruments | Cross-currency interest rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	3	6
Derivatives not designated as hedging instruments | Cross-currency interest rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 0	$ 0