Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 29, 2012	May 01, 2011	Apr. 29, 2012	May 01, 2011
Segment Reporting Information [Line Items]
Net sales	$ 1,821	$ 1,813	$ 6,094	$ 6,112
Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	985	991	3,618	3,657
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	576	569	1,735	1,723
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	$ 260	$ 253	$ 741	$ 732