Derivatives and Foreign Exchange Risk Management (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Jul. 29, 2011	Jul. 30, 2010	Apr. 29, 2011
Concentrations Of Credit Risk (Numeric) [Abstract]
Collateral Already Posted Aggregate Fair Value			$ 8
Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Line Items]
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net	20	(75)
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net	(46)	53
Derivatives and Foreign Exchange Risk Management (Numeric) [Abstract]
Gain Loss On Fair Value Hedge Ineffectiveness Net		2
Unrealized Gain (Loss) on Fair Value Hedging Instruments	142
Unrealized Gain Loss On Hedged Item In Fair Value Hedge	142
Derivatives and Foreign Exchange Risk Management [Abstract]
Notional Amount Of Foreign Currency Derivatives	6,765		6,834
Foreign Currency Transaction Gain Loss Realized	(56)		54
Notional Amount Of Foreign Currency Derivative Instruments Not Designated As Hedging Instruments	2,902		2,453
Gain Loss On Foreign Currency Derivative Instruments Not Designated As Hedging Instruments	(17)	21
Notional Amount Of Cash Flow Hedge Instruments	3,863		4,381
Maximum Length Of Time Hedged In Cash Flow Hedge	39-month
Unrealized Gain (Loss) on Cash Flow Hedging Instruments recorded in AOCL	244		257
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months	184
Derivatives and Foreign Exchange Risk Management Balance Sheet [Line Items]
Derivative Asset Designated as Hedging Instrument, Fair Value, Total	174		129
Derivative Asset Not Designated as Hedging Instrument, Fair Value, Total	1		1
Derivative Liability Designated as Hedging Instrument, Fair Value, Total	294		299
Derivative Liability Not Designated as Hedging Instrument, Fair Value, Total	2		4
Interest Rate Swaps [Line Items]
Interest Rate Swap Notional Amount	2,600		3,500
Other Comprehensive Income [Member]
Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Line Items]
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net	20	(75)
Other Expense [Member]
Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Line Items]
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net	(54)	54
Cost of Sales [Member]
Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Line Items]
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net	8	(1)
Prepaid Expenses and Other Current Assets [Member]
Derivatives and Foreign Exchange Risk Management Balance Sheet [Line Items]
Foreign Exchange Contract, Derivative Asset Designated as Hedging Instrument, Fair Value	29		19
Foreign Exchange Contract, Derivative Asset Not Designated as Hedging Instrument, Fair Value	1		1
Other Assets [Member]
Derivatives and Foreign Exchange Risk Management Balance Sheet [Line Items]
Foreign Exchange Contract, Derivative Asset Designated as Hedging Instrument, Fair Value	3		1
Interest Rate Contract, Derivative Asset Designated as Hedging Instrument, Fair Value	142		109
Total Assets Derivatives [Member]
Derivatives and Foreign Exchange Risk Management Balance Sheet [Line Items]
Derivative Fair Value Of Derivative Asset	175		130
Other Accrued Expenses [Member]
Derivatives and Foreign Exchange Risk Management Balance Sheet [Line Items]
Foreign Exchange Contract, Derivative Liability Not Designated as Hedging Instrument, Fair Value	2		4
Foreign Exchange Contract, Derivative Liability Designated as Hedging Instrument, Fair Value	231		235
Total Liabilities Derivatives [Member]
Derivatives and Foreign Exchange Risk Management Balance Sheet [Line Items]
Derivative Fair Value Of Derivative Liability	296		303
Other Long Term Liabilities Fx [Member]
Derivatives and Foreign Exchange Risk Management Balance Sheet [Line Items]
Foreign Exchange Contract, Derivative Liability Designated as Hedging Instrument, Fair Value	63		64
Terminated Interest Rate Swap [Member]
Interest Rate Swaps [Line Items]
Interest Rate Swap Inception Date	July 2011
Interest Rate Swap Notional Amount	900
Derivative Cash Received On Hedge	46
Accrued Interest Portion	10
Senior Notes 2010 Due 2015 [Member]
Financing Arrangements [Line Items]
Debt Instrument Face Amount	1,250
Debt Instrument Interest Rate Stated Percentage	3.00%
Senior Notes 2005 Due 2015 [Member]
Financing Arrangements [Line Items]
Debt Instrument Face Amount	600
Debt Instrument Interest Rate Stated Percentage	4.75%
Senior Notes 2011 Due 2016 [Member]
Financing Arrangements [Line Items]
Debt Instrument Face Amount	500
Debt Instrument Interest Rate Stated Percentage	2.63%
Senior Notes 2011 Due 2021 [Member]
Financing Arrangements [Line Items]
Debt Instrument Face Amount	500
Debt Instrument Interest Rate Stated Percentage	4.13%
Senior Convertible Notes Due 2013 [Member]
Financing Arrangements [Line Items]
Debt Instrument Interest Rate Stated Percentage	1.625%
Senior Notes 2009 Due 2014 [Member]
Financing Arrangements [Line Items]
Debt Instrument Face Amount	$ 550
Debt Instrument Interest Rate Stated Percentage	4.50%