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. 27, 2014	Apr. 28, 2013	Apr. 27, 2014	Apr. 28, 2013
Segment Reporting Information [Line Items]
Net sales	$ 1,970	$ 1,962	$ 6,416	$ 6,329
Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	1,063	1,040	3,626	3,611
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	597	601	1,912	1,805
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	$ 310	$ 321	$ 878	$ 913