Goodwill And Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2011	Aug. 01, 2010	Aug. 02, 2009	Jul. 31, 2011 Potential Scenario [Member]	May 04, 2009 Ecce Panis, Inc. [Member]
Amortization of amortizable intangible assets	less than $1	less than $1	less than $1
Estimated aggregated amortization expense year one	less than $1
Estimated aggregated amortization expense year two	less than $1
Estimated aggregated amortization expense year three	less than $1
Estimated aggregated amortization expense year four	less than $1
Estimated aggregated amortization expense year five	less than $1
Asset useful lives minimum range, years	10
Asset useful lives maximum range, years	20
Basis point increase in weighted average cost of capital				100
Impairment charge			$ 67	$ 21
Impairment charge	3
Carrying value of certain European trademarks	100
Intangible assets from acquisition					$ 16