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. 26, 2014	Jan. 27, 2013	Jan. 26, 2014	Jan. 27, 2013
Segment Reporting Information [Line Items]
Net sales	$ 2,281	$ 2,162	$ 4,446	$ 4,367
Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	1,329	1,279	2,563	2,571
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	670	592	1,315	1,204
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	$ 282	$ 291	$ 568	$ 592