Derivatives and Foreign Exchange Risk Management , Balance Sheet Presentation (Details) (USD $) In Millions, unless otherwise specified	Apr. 26, 2013	Apr. 27, 2012
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 394	$ 254
Liability derivatives	58	82
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	394	254
Liability derivatives	57	80
Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	150	74
Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	63	13
Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	34	33
Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	5	2
Designated as Hedging Instrument | Interest Rate Contracts | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	181	167
Designated as Hedging Instrument | Interest Rate Contracts | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	18	45
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	1	2
Not Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Not Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 1	$ 2