Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jul. 28, 2013	Apr. 28, 2013	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012	Apr. 29, 2012	Jan. 29, 2012	Oct. 30, 2011	Jul. 28, 2013	Jul. 29, 2012	Jul. 31, 2011
Segment Reporting Information [Line Items]
Net sales	$ 1,723	$ 1,962	$ 2,162	$ 2,205	$ 1,519	$ 1,698	$ 1,943	$ 2,015	$ 8,052	$ 7,175	$ 7,143
Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales									4,446	3,887	3,869
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales									2,408	2,320	2,321
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales									$ 1,198	$ 968	$ 953