Derivatives and Foreign Exchange Risk Management , Balance Sheet Presentation (Details) - USD ($) $ in Millions	Apr. 24, 2015	Apr. 25, 2014
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 733	$ 175
Liability derivatives	116	127
Foreign Currency Exchange Rate Contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	644	89
Liability derivatives	45	116
Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	89	86
Liability derivatives	71	11
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	614	175
Liability derivatives	86	125
Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	382	81
Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	143	8
Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	12	84
Designated as Hedging Instrument [Member] | Foreign Currency Exchange Rate Contracts | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	3	30
Designated as Hedging Instrument [Member] | Interest Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	10
Designated as Hedging Instrument [Member] | Interest Rate Contracts | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	79	73
Designated as Hedging Instrument [Member] | Interest Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	0
Designated as Hedging Instrument [Member] | Interest Rate Contracts | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	71	11
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	119	0
Liability derivatives	30	2
Not Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	119	0
Not Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 30	$ 2