Comprehensive Income and Accumulated Other Comprehensive Loss (Details) (USD $) In Millions	3 Months Ended	12 Months Ended
	Jul. 29, 2011	Apr. 29, 2011
Comprehensive Income and Accumulated Other Comprehensive Loss (Numeric) [Abstract]
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease	$ 960	$ 784
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax	6
Other Comprehensive Income Defined Benefit Plans Tax	6
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax	56
Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease	105
Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease	14
Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease	8
Other Comprehensive Income Derivatives Qualifying As Hedges Not Including Equity Investees Net Of Tax	13
Other Comprehensive Income Total Period Change	139
Comprehensive Income And Accumulated Other Comprehensive Loss [Line Items]
Beginning Balance	(224)
Ending Balance	(85)	(224)
Accumulated Net Unrealized Investment Gain Loss [Member]
Comprehensive Income And Accumulated Other Comprehensive Loss [Line Items]
Ending Balance	301	196
Accumulated Translation Adjustment [Member]
Comprehensive Income And Accumulated Other Comprehensive Loss [Line Items]
Ending Balance	457	443
Accumulated Defined Benefit Plans Adjustment [Member]
Comprehensive Income And Accumulated Other Comprehensive Loss [Line Items]
Ending Balance	(599)	(607)
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member]
Comprehensive Income And Accumulated Other Comprehensive Loss [Line Items]
Ending Balance	$ (244)	$ (257)