Derivatives and Foreign Exchange Risk Management, Balance Sheet Presentation (Details) (USD $) In Millions, unless otherwise specified	Oct. 24, 2014	Apr. 25, 2014
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 350	$ 175
Liability derivatives	57	127
Foreign Currency Exchange Rate Contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	260	89
Liability derivatives	27	116
Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	90	86
Liability derivatives	30	11
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	350	175
Liability derivatives	56	125
Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	153	81
Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	107	8
Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	26	84
Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	0	30
Designated as Hedging Instrument [Member] | Interest Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	20	13
Designated as Hedging Instrument [Member] | Interest Rate Contracts | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	70	73
Designated as Hedging Instrument [Member] | Interest Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0
Designated as Hedging Instrument [Member] | Interest Rate Contracts | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	30	11
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Liability derivatives	1	2
Not Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Not Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 1	$ 2