Business And Geographic Segment Information (Additional Product Information For Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2017	May 01, 2016	Apr. 30, 2017	May 01, 2016
Segment Reporting Information [Line Items]
Net sales	$ 1,853	$ 1,870	$ 6,226	$ 6,274
Soup [Member]
Segment Reporting Information [Line Items]
Net sales	557	575	2,251	2,253
Baked Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	600	584	1,914	1,886
Other Simple Meals [Member]
Segment Reporting Information [Line Items]
Net sales	434	424	1,299	1,300
Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	$ 262	$ 287	$ 762	$ 835