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. 28, 2013	Apr. 29, 2012	Apr. 28, 2013	Apr. 29, 2012
Segment Reporting Information [Line Items]
Net sales	$ 2,094	$ 1,821	$ 6,763	$ 6,094
Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	1,171	985	4,042	3,618
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	602	576	1,806	1,735
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	$ 321	$ 260	$ 915	$ 741