Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Jan. 29, 2017	Jan. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 2,171	$ 2,201	$ 4,373	$ 4,404
Soup [Member]
Segment Reporting Information [Line Items]
Net sales	831	821	1,694	1,678
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	661	664	1,314	1,302
Other Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	436	447	865	876
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	$ 243	$ 269	$ 500	$ 548