Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 29, 2012	Apr. 29, 2012	Jan. 29, 2012	Oct. 30, 2011	Jul. 31, 2011	May 01, 2011	Jan. 30, 2011	Oct. 31, 2010	Jul. 29, 2012	Jul. 31, 2011	Aug. 01, 2010
Segment Reporting Information [Line Items]
Net sales	$ 1,613	$ 1,821	$ 2,112	$ 2,161	$ 1,607	$ 1,813	$ 2,127	$ 2,172	$ 7,707	$ 7,719	$ 7,676
Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales									4,416	4,437	4,594
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales									2,320	2,321	2,129
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales									$ 971	$ 961	$ 953