Derivatives and Currency Exchange Risk Management - Classification and Fair Value Amounts of Derivative Instruments in Balance Sheets (Details) - USD ($) $ in Millions	Jul. 26, 2019	Apr. 26, 2019
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 318	$ 365
Derivative Liabilities, Fair Value	33	19
Currency exchange rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	308	335
Derivative Liabilities, Fair Value	33	19
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value		9
Total return swap
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	5	15
Derivative Liabilities, Fair Value	0
Cross currency interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	5	6
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	292	321
Derivative Liabilities, Fair Value	12	2
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	212	234
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	80	78
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	8	1
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	4	1
Derivatives designated as hedging instruments | Interest rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value		9
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value		0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	26	44
Derivative Liabilities, Fair Value	21	17
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	16	23
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	21	17
Derivatives not designated as hedging instruments | Total return swap | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	5	15
Derivatives not designated as hedging instruments | Total return swap | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	0	0
Derivatives not designated as hedging instruments | Cross currency interest rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	5	6
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