Derivatives and Currency Exchange Risk Management , Balance Sheet Presentation (Details) - USD ($) $ in Millions	Apr. 26, 2019	Apr. 27, 2018
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 365	$ 118
Derivative Liabilities	19	258
Currency exchange rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	335	79
Derivative Liabilities	19	238
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	9	8
Derivative Liabilities		14
Total return swaps
Derivatives, Fair Value [Line Items]
Derivative Assets	15	4
Stock warrants
Derivatives, Fair Value [Line Items]
Derivative Assets		21
Cross-currency interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	6	6
Derivative Liabilities		6
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	321	56
Derivative Liabilities	2	227
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	234	37
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	78	11
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1	162
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	1	51
Derivatives designated as hedging instruments | Interest rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	9	8
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	14
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	44	62
Derivative Liabilities	17	31
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	23	31
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	17	25
Derivatives not designated as hedging instruments | Total return swaps | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	15	4
Derivatives not designated as hedging instruments | Total return swaps | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments | Stock warrants | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets		21
Derivatives not designated as hedging instruments | Stock warrants | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities		0
Derivatives not designated as hedging instruments | Cross-currency interest rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	6	6
Derivatives not designated as hedging instruments | Cross-currency interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 0	$ 6