Business and Geographic Segment Information (Schedule of Additional Annual Product Information) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended		12 Months Ended
	May 01, 2011	May 02, 2010	May 01, 2011	May 02, 2010	Aug. 01, 2010	Aug. 02, 2009	Aug. 03, 2008
Net sales	$ 1,813	$ 1,802	$ 6,112	$ 6,158	$ 7,676	$ 7,586	$ 7,998
Simple Meals [Member]
Net sales	991	1,018	3,657	3,814	4,594	4,674	4,815
Baked Snacks [Member]
Net sales	569	515	1,723	1,617	2,129	1,995	2,200
Beverages [Member]
Net sales	$ 253	$ 269	$ 732	$ 727	$ 953	$ 917	$ 983