Derivatives and Foreign Exchange Risk Management (Effect on Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Oct. 28, 2011	Apr. 29, 2011
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 130
Derivative Liability, Fair Value, Gross Liability	190	303
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	177	129
Derivative Liability, Fair Value, Gross Liability	188	299
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	34	19
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	7	1
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	140	235
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Long-term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	38	64
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	136	109
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Long-term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	10
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	177	1
Derivative Liability, Fair Value, Gross Liability	2	4
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 2	$ 4