Business And Geographic Segment Information (Schedule Of Segment Reporting - Net Sales) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 30, 2011	Oct. 31, 2010
Segment Reporting Information [Line Items]
Net sales	$ 2,161	$ 2,172
U.S. Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	874	898
Global Baking And Snacking [Member]
Segment Reporting Information [Line Items]
Net sales	568	544
International Simple Meals And Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	359	372
U.S. Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	198	205
North America Foodservice [Member]
Segment Reporting Information [Line Items]
Net sales	$ 162	$ 153