Business And Geographic Segment Information (Schedule Of Segment Reporting - 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
U.S. Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales									2,726	2,751	2,938
Global Baking And Snacking [Member]
Segment Reporting Information [Line Items]
Net sales									2,193	2,156	1,975
International Simple Meals And Beverages [Member]
Segment Reporting Information [Line Items]
Net sales									1,404	1,463	1,423
U.S. Beverages [Member]
Segment Reporting Information [Line Items]
Net sales									774	759	762
North America Foodservice [Member]
Segment Reporting Information [Line Items]
Net sales									$ 610	$ 590	$ 578