Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jul. 30, 2017	Apr. 30, 2017	Jan. 29, 2017	Oct. 30, 2016	Jul. 31, 2016	May 01, 2016	Jan. 31, 2016	Nov. 01, 2015	Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Segment Reporting Information [Line Items]
Net sales	$ 1,664	$ 1,853	$ 2,171	$ 2,202	$ 1,687	$ 1,870	$ 2,201	$ 2,203	$ 7,890	$ 7,961	$ 8,082
Soup [Member]
Segment Reporting Information [Line Items]
Net sales									2,673	2,690	2,798
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales									2,511	2,479	2,502
Other Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales									1,698	1,702	1,648
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales									$ 1,008	$ 1,090	$ 1,134