Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 27, 2013	Jan. 29, 2012	Jan. 27, 2013	Jan. 29, 2012
Segment Reporting Information [Line Items]
Net sales	$ 2,333	$ 2,112	$ 4,669	$ 4,273
Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	1,449	1,323	2,871	2,633
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	592	557	1,204	1,159
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	$ 292	$ 232	$ 594	$ 481