Subsequent Events Subsequent Events (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended			13 Months Ended	3 Months Ended			3 Months Ended			3 Months Ended		3 Months Ended		3 Months Ended		13 Months Ended	3 Months Ended	13 Months Ended	3 Months Ended	13 Months Ended	3 Months Ended
	Jul. 29, 2012	Jul. 29, 2012	Jul. 31, 2011	Aug. 01, 2010	Jul. 29, 2012	Oct. 28, 2012 Acquisition [Member]	Aug. 06, 2012 Acquisition [Member]	Aug. 02, 2012 Acquisition [Member]	Jul. 29, 2012 Restructuring Charges And Related Costs [Member]	Oct. 28, 2012 Floating Rate Notes [Member] Acquisition [Member]	Aug. 02, 2012 Floating Rate Notes [Member] Acquisition [Member]	Oct. 28, 2012 Three Point Eight Percent Notes [Member] Acquisition [Member]	Aug. 02, 2012 Three Point Eight Percent Notes [Member] Acquisition [Member]	Oct. 28, 2012 Two Point Five Percent Notes [Member] Acquisition [Member]	Aug. 02, 2012 Two Point Five Percent Notes [Member] Acquisition [Member]	Jul. 29, 2012 Sacramento, CA [Member] Restructuring Charges And Related Costs [Member]	Jul. 29, 2012 South Plainfield, NJ [Member] Restructuring Charges And Related Costs [Member]	Jul. 29, 2012 Severance Pay And Benefits [Member]	Jul. 29, 2012 Severance Pay And Benefits [Member] Restructuring Charges And Related Costs [Member]	Jul. 29, 2012 Asset Impairment/Accelerated Depreciation [Member]	Jul. 29, 2012 Asset Impairment/Accelerated Depreciation [Member] Restructuring Charges And Related Costs [Member]	Jul. 29, 2012 Other Exit Costs [Member]	Jul. 29, 2012 Other Exit Costs [Member] Restructuring Charges And Related Costs [Member]
Subsequent Event [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price							$ 1,550
Debt Instrument, Face Amount											400		400		450
Stated interest rate													3.80%		2.50%
Fiscal Year of Maturity										8/1/2014		8/2/2042		8/2/2022
Debt Instrument, Description of Variable Rate Basis						LIBOR
Debt Instrument, Interest Rate, Basis for Effective Rate						.003
Commercial Paper	352	352	563		352			300
Business Combination, Acquisition Related Costs		5							5
Business Combination, Acquisition Related Costs After Tax	3								3
BusinessCombinationAcquisitionRelatedCostsPerDilutedShare	$ 0.01								$ 0.01
Expected Business Combination Acquisition Related Costs									11
Restructuring and Related Cost, Expected Number of Positions Eliminated									727							700	27
Restructuring and Related Cost, expected					75				115									43	25	23	75	9	15
Expected cash expenditures					50				38
Expected investment in capital expenditures					$ 40				$ 27