Derivatives and Currency Exchange Risk Management , Balance Sheet Presentation (Details) - USD ($) $ in Millions	Apr. 27, 2018	Apr. 28, 2017
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 118	$ 262
Derivative Liabilities	258	104
Currency exchange rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	79	216
Derivative Liabilities	238	93
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	8	41
Derivative Liabilities	14
Total return swaps
Derivatives, Fair Value [Line Items]
Derivative Assets	4
Stock warrants
Derivatives, Fair Value [Line Items]
Derivative Assets	21
Cross currency interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	6	5
Derivative Liabilities	6	11
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	56	241
Derivative Liabilities	227	57
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	37	152
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	11	48
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	162	43
Derivatives designated as hedging instruments | Currency exchange rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	51	14
Derivatives designated as hedging instruments | Interest rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	8	41
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	14	0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Assets	62	21
Derivative Liabilities	31	47
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	31	16
Derivatives not designated as hedging instruments | Currency exchange rate contracts | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	25	36
Derivatives not designated as hedging instruments | Total return swaps | Other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	4
Derivatives not designated as hedging instruments | Total return swaps | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative Liabilities	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	5
Derivatives not designated as hedging instruments | Cross currency interest rate contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 6	$ 11