Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) (USD $) In Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2011	May 01, 2011	Jan. 30, 2011	Oct. 31, 2010	Aug. 01, 2010	May 02, 2010	Jan. 31, 2010	Nov. 01, 2009	Jul. 31, 2011	Aug. 01, 2010	Aug. 02, 2009
Net sales	$ 1,607	$ 1,813	$ 2,127	$ 2,172	$ 1,518	$ 1,802	$ 2,153	$ 2,203	$ 7,719	$ 7,676	$ 7,586
Simple Meals [Member]
Net sales									4,437	4,594	4,674
Baked Snacks [Member]
Net sales									2,321	2,129	1,995
Beverages [Member]
Net sales									$ 961	$ 953	$ 917