Derivatives and Foreign Exchange Risk Management, Balance Sheet Presentation (Details) (USD $) In Millions, unless otherwise specified	Oct. 26, 2012	Apr. 27, 2012
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 283	$ 254
Liability derivatives	131	82
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	282	254
Liability derivatives	131	80
Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	71	74
Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	17	13
Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	33	33
Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	12	2
Designated as Hedging Instrument | Interest Rate Contracts | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	194	167
Designated as Hedging Instrument | Interest Rate Contracts | Other Long-term Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	86	45
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset derivatives	1	0
Liability derivatives	0	2
Not Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	1	0
Not Designated as Hedging Instrument | Foreign Currency Exchange Rate Contracts | Other Accrued Expenses
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 0	$ 2